'While' loop that pulls data from a matrix with n rows

Question

c_def 2018-2-6

0
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https://ww2.mathworks.cn/matlabcentral/answers/380955-while-loop-that-pulls-data-from-a-matrix-with-n-rows

评论： c_def 2018-2-6

I am trying to write a code to execute a 'while' loop from a matrix. The matrix it pulls the data from ideally has n lines (where n can vary depending on the .xls file uploaded and the number of rows it contains). Variables DRb and PRb are defined earlier in the code and are constants.

[min,el]=xlsread('file name.xls');
while f<=0.04
col=4;
atom=1;
ReverseMelt(row, atom)=f;atom=atom+1;
ReverseMelt(row, atom)=((min(6,col)/(DRb+f*(1-PRb))))^(-1); col=col+1;atom=atom+1;
*many more lines of calculations*
row=row+1;
f=f+0.005;
end

The data I am looking for this calculation starts at min(6,col) but I want the while loop, when it reaches f=0.04, to start again such that min(6,col) becomes min(7,col) and so on till the end of the matrix. I have tried a 'for' loop where I put before the while loop:

x=size(min)  
y=x(1,1)
For z=6:y
while f<=0.04
col=4;
atom=1;
 ReverseMelt(row, atom)=((min(y,col)/(DRb+f*(1-PRb))))^(-1); 
end
end

I thought this would make my while loop run from row 6 in matrix min to y (the number of total rows), but didn't go. Any ideas?

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Answer 1

Roy Kadesh 2018-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/380955-while-loop-that-pulls-data-from-a-matrix-with-n-rows#answer_303664

Your loop variable is z, while you use y inside your loop, so it repeats the same code y times (assuming you have hidden the code that re-initialized f for the second for-loop)

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Roy Kadesh 2018-2-6

You need to reset f, otherwise the while loop will exit immediately after the z=6 is done. You can see this if you use the debugger to step through your code.

c_def 2018-2-6