Can't Build Vector in While loop

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John Jacoby
John Jacoby 2017-7-18
评论： John Jacoby 2017-7-18
Hi all, I need to search through some data and extract a specific value and then put all these values together into a vector. Here's the code I'm working with:
chtype = channels{1,1}.hdr.channeltype;
n=1;
while chtype ~= 'Edge'
size = size(channels{n,1}.mrk, 1);
sizeVec(n) = size;
n = n+1;
chtype = channels{n,1}.hdr.channeltype;
end
I get the following error:
Matrix dimensions must agree.
Error in RFSize1 (line 11) while chtype ~= 'Edge'
To me it looks like I'm just adding onto vector sizeVec with value size. I'm not sure what dimension isn't in agreement. Thank you!

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Geoff Hayes
Geoff Hayes 2017-7-18
编辑：Geoff Hayes 2017-7-18
John - when comparing strings, use strcmpi or strcmp. The first would be used if you are making a case-insensitive comparison, the second if you care about case. Your code would then become
while ~strcmp(chtype,'Edge')
or
while ~strcmpi(chtype,'Edge')
Note that the error Matrix dimensions must agree. makes sense when comparing
chtype ~= 'Edge'
since chtype may have a different number of elements from the four character 'Edge'.
  1 个评论
John Jacoby
John Jacoby 2017-7-18
Thank you so much, I'm new and forgot that 'matrix' could refer to a string as well.

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