how to find max of 1000 values which are rows,i wrote a code it showed just one value and index that is not the max

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shina mokhtari 2016-2-17

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评论： shina mokhtari 2016-2-17

filename='realtimevalues.xlsx';
num=xlsread(filename);
y=filename(1,:);
[val idx]=max(y(:))

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Answer 1

Image Analyst 2016-2-17

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num is a 2D array of numbers, or it may be depending on how your data area arranged in the workbook. y is the first character of filename, which is 'r'. I think you want

y = num(1, :); % Extract first row only.

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Titus Edelhofer 2016-2-17

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Hmm, in the original post it's

y = filename(1,:)

?

y=num(:)

or

y=num(1,:)

both should give reasonable results, depending of what is searched for ...

shina mokhtari 2016-2-17

it is the signal values

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Answer 2

Titus Edelhofer 2016-2-17

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Hi Shina,

what exactly is the question: you think val is not the maximum of y? I don't see how this can happen ... Or are you interested in all indices where y is taking it's maximum? In this case you could do something like

idx = find(y(:)==max(y(:)));

Note though, that this is sensitive to floating point accuracy, so if you have

y = [1 1.0000000001 1]

this would find only idx=2.

Titus

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shina mokhtari 2016-2-17

you know i think the problem is i have 1000 values,and it show the wrong value and also index,for example when i write this code it show value 120 and index 16 wich is not true

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