No output from a for and elseif loop
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Mohammad R. Ghassemi
am 15 Okt. 2021
Kommentiert: Mohammad R. Ghassemi
am 15 Okt. 2021
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 Kommentare
Walter Roberson
am 15 Okt. 2021
What is readline() ? The readline() functions I can find in MATLAB require serial port or tcp port, and do not have a 'all' parameter.
Akzeptierte Antwort
DGM
am 15 Okt. 2021
Bearbeitet: DGM
am 15 Okt. 2021
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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