For loop problem (Help)

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zhixuan hong
zhixuan hong 2018-2-21
评论： Guillaume 2018-2-22
Hi guys , anyone can help me to check my coding ...
Current result, something wrong ...
Desire result , How to get table like this? I'm trying to create an auto data collection software by using GUI.
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Guillaume
Guillaume 2018-2-21
Code as found in the m file:
subjects={'No', 'IMC(%)','Status'}
fid=fopen('Version_1','w');
fprintf(fid,'%s %s %s \r\n',subjects{:});
for k = 1:n
if x>= 75
No = num2str(n);
IMC = num2str(areaRatio);
Status = 'Pass';
dlmwrite('Version_1',[No IMC Status],'-append','delimiter','\t','precision','%.2f');
else
No = num2str(n);
IMC = num2str(areaRatio);
Status = 'Fail';
dlmwrite('Version_1',[No IMC Status],'-append','delimiter','\t','precision','%.2f');
end
end

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Guillaume
Guillaume 2018-2-21
编辑：Guillaume 2018-2-21
As far as I can tell the only difference between the two branches of the if is the value of Status, so a better way of writing that if ... else would have been:
if x>= 75
Status = 'Pass';
else
Staus = 'Fail';
end
No = num2str(n);
IMC = num2str(areaRatio);
dlmwrite('Version_1',[No IMC Status],'-append','delimiter','\t','precision','%.2f');
Avoid writing the same thing twice since you double the chance that you make a mistake in one of them.
Also I'm not sure why you're using dlmwrite to write text. As your example show each character ends up separated by a tab. Not very readable.
As for your problem, your loop reduces to:
for k = 1:n
dlmwrite('Version_1', Variables_That_Do_Not_Depend_ON_k, ...)
end
Nothing depends on the iteration variable k in your loop, so, yes you're going to be writing n times the same things. I suspect that No should be
No = num2str(k);
As for x and areaRatio, since they're both scalar I have no idea how they're supposed to change in the loop. Note that x and areaRatio are the same since earlier you have x = areaRatio. Why have two names for the thing? It just adds confusion.
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zhixuan hong
zhixuan hong 2018-2-22
yup , the IMC also a variable . After pressing the push button, areaRatio/x (IMC) will be calculated by using formula under push button function.
Guillaume
Guillaume 2018-2-22
How to vary areaRatio/x/IMC
I don't know! You tell us. Only you knows what you intended to do with that loop but didn't do.

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