Error-checking in a matrix

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Salima
Salima 2014-11-17
编辑： Salima 2014-11-21
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Geoff Hayes
Geoff Hayes 2014-11-17
Salima - try stepping through your code (with the debugger) to see what is going wrong. Look at the first if condition
if data(1,1:c)==-1
Note that data(1,1:c) is a vector of four elements because you are asking for all elements in the first row. This vector can never be equal to negative one, and so always returns false. Change the condition to
if find(data(1,:)==-1)
or
if any(data(1,:)==-1)
Re-run the code with the above change and see what happens!
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Geoff Hayes
Geoff Hayes 2014-11-17
Salima - please post your example data matrix. If it is a large matrix, then just attach it as a mat file (so save the variable to file as save('myData.mat','data') then use the paperclip button to attach this file.
Or step through the code with the debugger to see what is going wrong.
Geoff Hayes
Geoff Hayes 2014-11-17
Salima - I'm not sure what the format is for the file you attached; it isn't a csv file.
As for the else block code, you should name your indices differently from those two variables, r and c that are the number of rows and columns in your matrix. If you want to move backwards from the last row, you need to specify the step size as a negative one.
[r , c] = size(data);
if any(data(r,:)==-1)
data(any(data==-1,2),:) = []
else
for u=r-1:-1:1
for v=1:c
if data(u,v)==-1
data(u,v)=data(u+1,v)
end
end
end
end

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