source: trunk/src/SDMemTable.cc@ 46

Last change on this file since 46 was 39, checked in by mmarquar, 21 years ago

Added handling of frequencies, SpectralCoordinate and an abscissa retrieval function,
  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 18.3 KB
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1//#---------------------------------------------------------------------------
2//# SDMemTable.cc: A MemoryTable container for single dish integrations
3//#---------------------------------------------------------------------------
4//# Copyright (C) 2004
5//# Malte Marquarding, ATNF
6//#
7//# This program is free software; you can redistribute it and/or modify it
8//# under the terms of the GNU General Public License as published by the Free
9//# Software Foundation; either version 2 of the License, or (at your option)
10//# any later version.
11//#
12//# This program is distributed in the hope that it will be useful, but
13//# WITHOUT ANY WARRANTY; without even the implied warranty of
14//# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15//# Public License for more details.
16//#
17//# You should have received a copy of the GNU General Public License along
18//# with this program; if not, write to the Free Software Foundation, Inc.,
19//# 675 Massachusetts Ave, Cambridge, MA 02139, USA.
20//#
21//# Correspondence concerning this software should be addressed as follows:
22//# Internet email: Malte.Marquarding@csiro.au
23//# Postal address: Malte Marquarding,
24//# Australia Telescope National Facility,
25//# P.O. Box 76,
26//# Epping, NSW, 2121,
27//# AUSTRALIA
28//#
29//# $Id:
30//#---------------------------------------------------------------------------
31
32
33#include <aips/iostream.h>
34#include <aips/Arrays/Array.h>
35#include <aips/Arrays/ArrayMath.h>
36#include <aips/Arrays/MaskArrMath.h>
37#include <aips/Arrays/ArrayLogical.h>
38#include <aips/Arrays/ArrayAccessor.h>
39
40#include <aips/Tables/TableParse.h>
41#include <aips/Tables/TableDesc.h>
42#include <aips/Tables/SetupNewTab.h>
43#include <aips/Tables/ScaColDesc.h>
44#include <aips/Tables/ArrColDesc.h>
45
46#include <aips/Tables/ExprNode.h>
47#include <aips/Tables/ScalarColumn.h>
48#include <aips/Tables/ArrayColumn.h>
49#include <aips/Tables/TableRecord.h>
50#include <aips/Measures/MFrequency.h>
51
52#include "SDMemTable.h"
53#include "SDContainer.h"
54
55using namespace atnf_sd;
56
57SDMemTable::SDMemTable() :
58 IFSel_(0),
59 beamSel_(0),
60 polSel_(0) {
61 setup();
62}
63SDMemTable::SDMemTable(const std::string& name) :
64 IFSel_(0),
65 beamSel_(0),
66 polSel_(0) {
67 Table tab("dummy");
68 table_ = tab.copyToMemoryTable("dummy");
69}
70
71SDMemTable::SDMemTable(const SDMemTable& other, Bool clear) {
72 this->IFSel_= other.IFSel_;
73 this->beamSel_= other.beamSel_;
74 this->polSel_= other.polSel_;
75 this->chanMask_ = other.chanMask_;
76 this->table_ = other.table_.copyToMemoryTable(String("dummy"));
77 // clear all rows()
78 if (clear) {
79 this->table_.removeRow(this->table_.rowNumbers());
80 } else {
81 this->IFSel_ = other.IFSel_;
82 this->beamSel_ = other.beamSel_;
83 this->polSel_ = other.polSel_;
84 }
85}
86
87SDMemTable::SDMemTable(const Table& tab, Int scanID) :
88 IFSel_(0),
89 beamSel_(0),
90 polSel_(0) {
91 String exprs = String("select * from $1 where SCANID == ")
92 +String::toString(scanID);
93 cerr << exprs << endl;
94 Table t = tableCommand(exprs,tab);
95 table_ = t.copyToMemoryTable("dummy");
96}
97
98SDMemTable::~SDMemTable(){
99 cerr << "goodbye from SDMemTable @ " << this << endl;
100}
101
102SDMemTable SDMemTable::getScan(Int scanID) {
103 return SDMemTable(table_, scanID);
104}
105
106void SDMemTable::setup() {
107 TableDesc td("", "1", TableDesc::Scratch);
108 td.comment() = "A SDMemTable";
109 td.addColumn(ScalarColumnDesc<Double>("TIME"));
110 td.addColumn(ScalarColumnDesc<String>("SRCNAME"));
111 td.addColumn(ArrayColumnDesc<Float>("SPECTRA"));
112 td.addColumn(ArrayColumnDesc<uChar>("FLAGTRA"));
113 td.addColumn(ArrayColumnDesc<Float>("TSYS"));
114 td.addColumn(ScalarColumnDesc<Int>("SCANID"));
115 td.addColumn(ScalarColumnDesc<Double>("INTERVAL"));
116 td.addColumn(ArrayColumnDesc<uInt>("FREQID"));
117 // Now create a new table from the description.
118
119 SetupNewTable aNewTab("dummy", td, Table::New);
120 table_ = Table(aNewTab, Table::Memory, 0);
121}
122
123std::string SDMemTable::getSourceName(Int whichRow) const {
124 ROScalarColumn<String> src(table_, "SRCNAME");
125 String name;
126 src.get(whichRow, name);
127 return name;
128}
129
130Double SDMemTable::getTime(Int whichRow) const {
131 ROScalarColumn<Double> src(table_, "TIME");
132 Double tm;
133 src.get(whichRow, tm);
134 return tm;
135}
136
137bool SDMemTable::setIF(Int whichIF) {
138 //if ( whichIF >= 0 && whichIF < nIF_) {
139 IFSel_ = whichIF;
140 return true;
141 //}
142 //return false;
143}
144bool SDMemTable::setBeam(Int whichBeam) {
145 //if ( whichBeam >= 0 && whichBeam < nBeam_) {
146 beamSel_ = whichBeam;
147 return true;
148 //}
149 //return false;
150
151}
152bool SDMemTable::setPol(Int whichPol) {
153 //if ( whichPol >= 0 && whichPol < nPol_) {
154 polSel_ = whichPol;
155 return true;
156 //}
157 //return false;
158}
159
160bool SDMemTable::setMask(const std::vector<int>& whichChans) {
161 ROArrayColumn<uChar> spec(table_, "FLAGTRA");
162
163 std::vector<int>::iterator it;
164 uInt n = spec.shape(0)(3);
165 chanMask_.resize(n,true);
166 for (it = whichChans.begin(); it != whichChans.end(); ++it) {
167 if (*it < n)
168 chanMask_[*it] = false;
169 }
170 return true;
171}
172
173std::vector<bool> SDMemTable::getMask(Int whichRow) const {
174 std::vector<bool> mask;
175 ROArrayColumn<uChar> spec(table_, "FLAGTRA");
176 Array<uChar> arr;
177 spec.get(whichRow, arr);
178 ArrayAccessor<uChar, Axis<0> > aa0(arr);
179 aa0.reset(aa0.begin(uInt(beamSel_)));//go to beam
180 ArrayAccessor<uChar, Axis<1> > aa1(aa0);
181 aa1.reset(aa1.begin(uInt(IFSel_)));// go to IF
182 ArrayAccessor<uChar, Axis<2> > aa2(aa1);
183 aa2.reset(aa2.begin(uInt(polSel_)));// go to pol
184
185 Bool useUserMask = ( chanMask_.size() == arr.shape()(3) );
186
187 std::vector<bool> tmp;
188 tmp = chanMask_; // WHY the fxxx do I have to make a copy here
189 std::vector<bool>::iterator miter;
190 miter = tmp.begin();
191
192 for (ArrayAccessor<uChar, Axis<3> > i(aa2); i != i.end(); ++i) {
193 bool out =!static_cast<bool>(*i);
194 if (useUserMask) {
195 out = out && (*miter);
196 miter++;
197 }
198 mask.push_back(out);
199 }
200 return mask;
201}
202std::vector<float> SDMemTable::getSpectrum(Int whichRow) {
203
204 std::vector<float> spectrum;
205 ROArrayColumn<Float> spec(table_, "SPECTRA");
206 Array<Float> arr;
207 spec.get(whichRow, arr);
208 ArrayAccessor<Float, Axis<0> > aa0(arr);
209 aa0.reset(aa0.begin(uInt(beamSel_)));//go to beam
210 ArrayAccessor<Float, Axis<1> > aa1(aa0);
211 aa1.reset(aa1.begin(uInt(IFSel_)));// go to IF
212 ArrayAccessor<Float, Axis<2> > aa2(aa1);
213 aa2.reset(aa2.begin(uInt(polSel_)));// go to pol
214 for (ArrayAccessor<Float, Axis<3> > i(aa2); i != i.end(); ++i) {
215 spectrum.push_back(*i);
216 }
217 return spectrum;
218}
219
220std::vector<double> SDMemTable::getAbscissa(Int whichRow,
221 const std::string& whichUnit,
222 double restfreq) {
223 std::vector<double> absc(nChan());
224 Vector<Double> absc1(nChan());
225 indgen(absc1);
226 ROArrayColumn<uInt> fid(table_, "FREQID");
227 Vector<uInt> v;
228 fid.get(whichRow, v);
229 uInt specidx = v(IFSel_);
230 cerr << "specidx = " << specidx << endl;
231 Unit u;
232 if (whichUnit == "") {
233 // get unit from table
234 } else {
235 u = String(whichUnit);
236 }
237 SpectralCoordinate spc = getCoordinate(specidx);
238 cerr << "debug" << endl;
239 if ( u == Unit("km/s") ) {
240 cerr << "vel ??? " << restfreq << endl;
241 if (Double(restfreq) > Double(0.000001)) {
242 cerr << "converting to velocities"<< endl;
243 spc.setRestFrequency(Double(restfreq));
244 spc.setVelocity(u.getName());
245 Vector<Double> wrld;
246 spc.pixelToVelocity(wrld,absc1);
247 std::vector<double>::iterator it;
248 uInt i = 0;
249 for (it = absc.begin(); it != absc.end(); ++it) {
250 (*it) = wrld[i];
251 i++;
252 }
253 }
254 } else if (u == Unit("Hz")) {
255 Vector<String> wau(1); wau = u.getName();
256 spc.setWorldAxisUnits(wau);
257 cerr << " converting in frequency" << endl;
258 std::vector<double>::iterator it;
259 Double tmp;
260 uInt i = 0;
261 for (it = absc.begin(); it != absc.end(); ++it) {
262
263 spc.toWorld(tmp,absc1[i]);
264 (*it) = tmp;
265 i++;
266 }
267 cerr << "converted all pic to world" << endl;
268 }
269 cerr << "exiting getAbscissa" << endl;
270 return absc;
271}
272
273void SDMemTable::getSpectrum(Vector<Float>& spectrum, Int whichRow=0) {
274 ROArrayColumn<Float> spec(table_, "SPECTRA");
275 Array<Float> arr;
276 spec.get(whichRow, arr);
277 spectrum.resize(arr.shape()(3));
278 ArrayAccessor<Float, Axis<0> > aa0(arr);
279 aa0.reset(aa0.begin(uInt(beamSel_)));//go to beam
280 ArrayAccessor<Float, Axis<1> > aa1(aa0);
281 aa1.reset(aa1.begin(uInt(IFSel_)));// go to IF
282 ArrayAccessor<Float, Axis<2> > aa2(aa1);
283 aa2.reset(aa2.begin(uInt(polSel_)));// go to pol
284
285 ArrayAccessor<Float, Axis<0> > va(spectrum);
286 for (ArrayAccessor<Float, Axis<3> > i(aa2); i != i.end(); ++i) {
287 (*va) = (*i);
288 va++;
289 }
290}
291
292void SDMemTable::getMask(Vector<Bool>& mask, Int whichRow=0) const {
293 ROArrayColumn<uChar> spec(table_, "FLAGTRA");
294 Array<uChar> arr;
295 spec.get(whichRow, arr);
296 mask.resize(arr.shape()(3));
297
298 ArrayAccessor<uChar, Axis<0> > aa0(arr);
299 aa0.reset(aa0.begin(uInt(beamSel_)));//go to beam
300 ArrayAccessor<uChar, Axis<1> > aa1(aa0);
301 aa1.reset(aa1.begin(uInt(IFSel_)));// go to IF
302 ArrayAccessor<uChar, Axis<2> > aa2(aa1);
303 aa2.reset(aa2.begin(uInt(polSel_)));// go to pol
304
305 Bool useUserMask = ( chanMask_.size() == arr.shape()(3) );
306
307 ArrayAccessor<Bool, Axis<0> > va(mask);
308 std::vector<bool> tmp;
309 tmp = chanMask_; // WHY the fxxx do I have to make a copy here. The
310 // iterator should work on chanMask_??
311 std::vector<bool>::iterator miter;
312 miter = tmp.begin();
313
314 for (ArrayAccessor<uChar, Axis<3> > i(aa2); i != i.end(); ++i) {
315 bool out =!static_cast<bool>(*i);
316 if (useUserMask) {
317 out = out && (*miter);
318 miter++;
319 }
320 (*va) = out;
321 va++;
322 }
323}
324
325MaskedArray<Float> SDMemTable::rowAsMaskedArray(uInt whichRow,
326 Bool useSelection) {
327 ROArrayColumn<Float> spec(table_, "SPECTRA");
328 Array<Float> arr;
329 ROArrayColumn<uChar> flag(table_, "FLAGTRA");
330 Array<uChar> farr;
331 spec.get(whichRow, arr);
332 flag.get(whichRow, farr);
333 Array<Bool> barr(farr.shape());convertArray(barr, farr);
334 MaskedArray<Float> marr;
335 if (useSelection) {
336 ArrayAccessor<Float, Axis<0> > aa0(arr);
337 aa0.reset(aa0.begin(uInt(beamSel_)));//go to beam
338 ArrayAccessor<Float, Axis<1> > aa1(aa0);
339 aa1.reset(aa1.begin(uInt(IFSel_)));// go to IF
340 ArrayAccessor<Float, Axis<2> > aa2(aa1);
341 aa2.reset(aa2.begin(uInt(polSel_)));// go to pol
342
343 ArrayAccessor<Bool, Axis<0> > baa0(barr);
344 baa0.reset(baa0.begin(uInt(beamSel_)));//go to beam
345 ArrayAccessor<Bool, Axis<1> > baa1(baa0);
346 baa1.reset(baa1.begin(uInt(IFSel_)));// go to IF
347 ArrayAccessor<Bool, Axis<2> > baa2(baa1);
348 baa2.reset(baa2.begin(uInt(polSel_)));// go to pol
349
350 Vector<Float> a(arr.shape()(3));
351 Vector<Bool> b(barr.shape()(3));
352 ArrayAccessor<Float, Axis<0> > a0(a);
353 ArrayAccessor<Bool, Axis<0> > b0(b);
354
355 ArrayAccessor<Bool, Axis<3> > j(baa2);
356 for (ArrayAccessor<Float, Axis<3> > i(aa2); i != i.end(); ++i) {
357 (*a0) = (*i);
358 (*b0) = !(*j);
359 j++;
360 a0++;
361 b0++;
362 }
363 marr.setData(a,b);
364 } else {
365 marr.setData(arr,!barr);
366 }
367 return marr;
368}
369
370Float SDMemTable::getTsys(Int whichRow) const {
371 ROArrayColumn<Float> ts(table_, "TSYS");
372 Array<Float> arr;
373 ts.get(whichRow, arr);
374 Float out;
375 IPosition ip(arr.shape());
376 ip(0) = beamSel_;ip(1) = IFSel_;ip(2) = polSel_;ip(3)=0;
377 out = arr(ip);
378 return out;
379}
380
381SpectralCoordinate SDMemTable::getCoordinate(uInt whichIdx) const {
382
383 Table t = table_.keywordSet().asTable("FREQUENCIES");
384 if (whichIdx > t.nrow() ) {
385 cerr << "SDMemTable::getCoordinate - whichIdx out of range" << endl;
386 return;
387 }
388 Double rp,rv,inc;
389 String rf;
390 ROScalarColumn<Double> rpc(t, "REFPIX");
391 ROScalarColumn<Double> rvc(t, "REFVAL");
392 ROScalarColumn<Double> incc(t, "INCREMENT");
393 t.keywordSet().get("REFFRAME",rf);
394
395 MFrequency::Types mft;
396 if (!MFrequency::getType(mft, rf)) {
397 cerr << "Frequency type unknown assuming TOPO" << endl;
398 mft = MFrequency::TOPO;
399 }
400 rpc.get(whichIdx, rp);
401 rvc.get(whichIdx, rv);
402 incc.get(whichIdx, inc);
403 cerr << "creating speccord from " << whichIdx << ": "
404 << rp <<", " << rv << ", " << inc << ", " << mft <<endl;
405 SpectralCoordinate spec(mft,rv,inc,rp);
406 cerr << "debugit" << endl;
407 return spec;
408}
409
410bool SDMemTable::putSDFreqTable(const SDFrequencyTable& sdft) {
411 TableDesc td("", "1", TableDesc::Scratch);
412 td.addColumn(ScalarColumnDesc<Double>("REFPIX"));
413 td.addColumn(ScalarColumnDesc<Double>("REFVAL"));
414 td.addColumn(ScalarColumnDesc<Double>("INCREMENT"));
415 SetupNewTable aNewTab("freqs", td, Table::New);
416 Table aTable (aNewTab, Table::Memory, sdft.length());
417 ScalarColumn<Double> sc0(aTable, "REFPIX");
418 ScalarColumn<Double> sc1(aTable, "REFVAL");
419 ScalarColumn<Double> sc2(aTable, "INCREMENT");
420 for (uInt i=0; i < sdft.length(); ++i) {
421 sc0.put(i,sdft.referencePixel(i));
422 sc1.put(i,sdft.referenceValue(i));
423 sc2.put(i,sdft.increment(i));
424 }
425 aTable.rwKeywordSet().define("REFFRAME", sdft.refFrame());
426 aTable.rwKeywordSet().define("EQUINOX", sdft.equinox());
427 aTable.rwKeywordSet().define("Unit", String("kms-1"));
428 table_.rwKeywordSet().defineTable ("FREQUENCIES", aTable);
429 cerr << "debug - putSDFreqTable" << endl;
430 return True;
431}
432
433SDFrequencyTable SDMemTable::getSDFreqTable() const {
434 SDFrequencyTable sdft;
435
436 return sdft;
437}
438
439bool SDMemTable::putSDContainer(const SDContainer& sdc) {
440 ScalarColumn<Double> mjd(table_, "TIME");
441 ScalarColumn<String> srcn(table_, "SRCNAME");
442 ArrayColumn<Float> spec(table_, "SPECTRA");
443 ArrayColumn<uChar> flags(table_, "FLAGTRA");
444 ArrayColumn<Float> ts(table_, "TSYS");
445 ScalarColumn<Int> scan(table_, "SCANID");
446 ScalarColumn<Double> integr(table_, "INTERVAL");
447 ArrayColumn<uInt> freqid(table_, "FREQID");
448
449 uInt rno = table_.nrow();
450 table_.addRow();
451
452 mjd.put(rno, sdc.timestamp);
453 srcn.put(rno, sdc.sourcename);
454 spec.put(rno, sdc.getSpectrum());
455 flags.put(rno, sdc.getFlags());
456 ts.put(rno, sdc.getTsys());
457 scan.put(rno, sdc.scanid);
458 integr.put(rno, sdc.interval);
459 freqid.put(rno, sdc.getFreqMap());
460
461 return true;
462}
463
464SDContainer SDMemTable::getSDContainer(uInt whichRow) const {
465 ROScalarColumn<Double> mjd(table_, "TIME");
466 ROScalarColumn<String> srcn(table_, "SRCNAME");
467 ROArrayColumn<Float> spec(table_, "SPECTRA");
468 ROArrayColumn<uChar> flags(table_, "FLAGTRA");
469 ROArrayColumn<Float> ts(table_, "TSYS");
470 ROScalarColumn<Int> scan(table_, "SCANID");
471 ROScalarColumn<Double> integr(table_, "INTERVAL");
472 ROArrayColumn<uInt> freqid(table_, "FREQID");
473
474 SDContainer sdc(nBeam(),nIF(),nPol(),nChan());
475 mjd.get(whichRow, sdc.timestamp);
476 srcn.get(whichRow, sdc.sourcename);
477 integr.get(whichRow, sdc.interval);
478 scan.get(whichRow, sdc.scanid);
479 Array<Float> spectrum;
480 Array<Float> tsys;
481 Array<uChar> flagtrum;
482 Vector<uInt> fmap;
483 spec.get(whichRow, spectrum);
484 sdc.putSpectrum(spectrum);
485 flags.get(whichRow, flagtrum);
486 sdc.putFlags(flagtrum);
487 ts.get(whichRow, tsys);
488 sdc.putTsys(tsys);
489 freqid.get(whichRow, fmap);
490 sdc.putFreqMap(fmap);
491 return sdc;
492}
493bool SDMemTable::putSDHeader(const SDHeader& sdh) {
494 table_.lock();
495 table_.rwKeywordSet().define("nIF", sdh.nif);
496 table_.rwKeywordSet().define("nBeam", sdh.nbeam);
497 table_.rwKeywordSet().define("nPol", sdh.npol);
498 table_.rwKeywordSet().define("nChan", sdh.nchan);
499 table_.rwKeywordSet().define("Observer", sdh.observer);
500 table_.rwKeywordSet().define("Project", sdh.project);
501 table_.rwKeywordSet().define("Obstype", sdh.obstype);
502 table_.rwKeywordSet().define("AntennaName", sdh.antennaname);
503 table_.rwKeywordSet().define("AntennaPosition", sdh.antennaposition);
504 table_.rwKeywordSet().define("Equinox", sdh.equinox);
505 table_.rwKeywordSet().define("FreqRefFrame", sdh.freqref);
506 table_.rwKeywordSet().define("FreqRefVal", sdh.reffreq);
507 table_.rwKeywordSet().define("Bandwidth", sdh.bandwidth);
508 table_.rwKeywordSet().define("UTC", sdh.utc);
509 table_.unlock();
510 cerr << "Table Header set" << endl;
511 return true;
512}\
513
514SDHeader SDMemTable::getSDHeader() const {
515 SDHeader sdh;
516 table_.keywordSet().get("nBeam",sdh.nbeam);
517 table_.keywordSet().get("nIF",sdh.nif);
518 table_.keywordSet().get("nPol",sdh.npol);
519 table_.keywordSet().get("nChan",sdh.nchan);
520 table_.keywordSet().get("Observer", sdh.observer);
521 table_.keywordSet().get("Project", sdh.project);
522 table_.keywordSet().get("Obstype", sdh.obstype);
523 table_.keywordSet().get("AntennaName", sdh.antennaname);
524 table_.keywordSet().get("AntennaPosition", sdh.antennaposition);
525 table_.keywordSet().get("Equinox", sdh.equinox);
526 table_.keywordSet().get("FreqRefFrame", sdh.freqref);
527 table_.keywordSet().get("FreqRefVal", sdh.reffreq);
528 table_.keywordSet().get("Bandwidth", sdh.bandwidth);
529 table_.keywordSet().get("UTC", sdh.utc);
530 return sdh;
531}
532void SDMemTable::makePersistent(const std::string& filename) {
533 table_.deepCopy(filename,Table::New);
534}
535
536void SDMemTable::summary() const {
537 ROScalarColumn<Int> scans(table_, "SCANID");
538 ROScalarColumn<String> srcs(table_, "SRCNAME");
539 cout << "*************** Header ***************" << endl;
540 cout << "nBeam = " << nBeam() << "\t"
541 << "nIF = " << nIF() << endl
542 << "nPol = " << nPol() << "\t"
543 << "nChan = " << nChan() << "\t" << endl;
544 cout << "*************** Header ***************" << endl;
545 uInt count = 0;
546 String name;
547 Int previous = -1;Int current=0;
548 cout << "Scan\tSource" << endl;
549 for (uInt i=0; i< scans.nrow();i++) {
550 scans.getScalar(i,current);
551 if (previous != current) {
552 srcs.getScalar(i,name);
553 previous = current;
554 count++;
555 cout << count << "\t"
556 << name
557 << endl;
558 }
559 }
560 cout << "Table contains " << table_.nrow() << " integration(s)." << endl;
561 cout << "in " << count << " scan(s)." << endl;
562}
563
564Int SDMemTable::nBeam() const {
565 Int n;
566 table_.keywordSet().get("nBeam",n);
567 return n;
568}
569Int SDMemTable::nIF() const {
570 Int n;
571 table_.keywordSet().get("nIF",n);
572 return n;
573}
574Int SDMemTable::nPol() const {
575 Int n;
576 table_.keywordSet().get("nPol",n);
577 return n;
578}
579Int SDMemTable::nChan() const {
580 Int n;
581 table_.keywordSet().get("nChan",n);
582 return n;
583}
584/*
585void SDMemTable::maskChannels(const std::vector<Int>& whichChans ) {
586
587 std::vector<int>::iterator it;
588 ArrayAccessor<uChar, Axis<2> > j(flags_);
589 for (it = whichChans.begin(); it != whichChans.end(); it++) {
590 j.reset(j.begin(uInt(*it)));
591 for (ArrayAccessor<uChar, Axis<0> > i(j); i != i.end(); ++i) {
592 for (ArrayAccessor<uChar, Axis<1> > ii(i); ii != ii.end(); ++ii) {
593 for (ArrayAccessor<uChar, Axis<3> > iii(ii);
594 iii != iii.end(); ++iii) {
595 (*iii) =
596 }
597 }
598 }
599 }
600
601}
602*/
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