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Help with making parfor loop work

조회 수: 3 (최근 30일)
Quy
Quy 2024년 3월 19일
댓글: Edric Ellis 2024년 3월 20일
Need help making the code below run in parfor loop. The errors are:
"The parfor loop cannot run due to the way symTable is used"
"The parfor loop cannot run due to the way asymTable is used"
freqVec = freqMin:freqStep:freqMax;
fullModes = 1:4;
symTab = ["Frequency" ; "S"+string(fullModes'-1) + " Cp"];
asymTab = ["Frequency" ; "A"+string(fullModes'-1) + " Cp"];
tableTypes = repmat("double",1,fullModes(end)+1);
symTable = table('Size',[length(freqMin:freqStep:freqMax) fullModes(end)+1],'VariableNames', ...
symTab,'VariableTypes',tableTypes);
asymTable = table('Size',[length(freqMin:freqStep:freqMax) fullModes(end)+1],'VariableNames', ...
asymTab,'VariableTypes',tableTypes);
parfor ii = 1:length(freqVec)
currentFreq = freqVec(ii);
symCTR = 1;
asymCTR = 1;
%LOTS OF CODE HERE TO DETERMINE Cp, which is a 2x10 matrix
for modeType = 1:2
if any(CpFin(1,:) ~= 0,2) % store root results into table based on mode.
symTable(ii,1) = {currentFreq};
asymTable(ii,1) = {currentFreq};
for j = 1:size(CpFin,2)
if modeType == 1
if symCTR > width(symTable)-1
continue
elseif CpFin(1,j) == 0
continue
elseif round(CpFin(1,j)) == Cs || round(CpFin(1,j)) == Cl
continue
end
symTable(ii,symCTR+1) = {CpFin(1,j)};
symCTR = symCTR + 1;
else
if asymCTR > width(asymTable)-1
continue
elseif CpFin(1,j) == 0
continue
elseif round(CpFin(1,j)) == Cs || round(CpFin(1,j)) == Cl
continue
end
asymTable(ii,asymCTR+1) = {CpFin(1,j)};
asymCTR = asymCTR + 1;
end
end
end
end
end

채택된 답변

Walter Roberson
Walter Roberson 2024년 3월 19일
First of all, you are permitted only one assignment into a variable indexed by your parfor loop. Having
symTable(ii,1) = {currentFreq};
and
symTable(ii,symCTR+1) = {CpFin(1,j)};
is not allowed.
What you effectively have to do is assign into a temporary variable, and then assign the temporary variable to symTable(ii,:)
  댓글 수: 1
Edric Ellis
Edric Ellis 2024년 3월 20일
This is correct. You will also need to move the computation width(symTable) to before the parfor loop. The same applies to asymTable.

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