No output from a for and elseif loop
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Mohammad R. Ghassemi
2021 年 10 月 15 日
コメント済み: Mohammad R. Ghassemi
2021 年 10 月 15 日
Hi,
I am trying to get the J matrix from the following simple code, however I receive no output for J:
str=readline('1C1S.txt','all');
P=strfind(str,'w');
for x=1:numel(str)
if isempty(P(x,1))
J=1;
elseif isequal(P(x,1),[9])
J=2;
elseif isequal(P(x,1),[4])
J=3;
elseif isequal(P(x,1),[4 9])
J=4;
end
end
2 件のコメント
Walter Roberson
2021 年 10 月 15 日
What is readline() ? The readline() functions I can find in MATLAB require serial port or tcp port, and do not have a 'all' parameter.
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DGM
2021 年 10 月 15 日
編集済み: DGM
2021 年 10 月 15 日
That should be readlines().
P is a cell array of numeric vectors, so address it accordingly.
Any assignment to J overwrites the prior value in J.
The case where none of the conditional tests is true is not handled.
The equality tests are probably wrong, but since there's no description of the intended logic, I don't know what to tell you.
To summarize:
isequal(P(x,1),[4 9])
is never true, because P(x,1) is a cell scalar, which is never equal to any numeric vector.
isequal(P{x,1},[4 9])
is only true if the vector in P{x,1} is identical to [4 9]. That is, it needs to be the same length and all elements must match.
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