For loop problem (Help)

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.

[KSSV]

Attach code or copy code here....not image snippets....

[Guillaume]

Pictures of code are not particularly useful. We can't copy/paste the code making it much harder to test/debug/modify/give you a corrected version. Plus, your picture is not particularly sharp, and on my screen I can barely read your code.

Copy/paste the code in your question (then use the {}Code button) or attach it as an m file.

Also gives us a better description of the problem.

[zhixuan hong]

m file

[Guillaume]

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

Answer 1

[Guillaume]

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.

[zhixuan hong]

Thanks for your reply . really appreciate but the result like this , IMC and Status keep repeat...

for k = 1:n

if x>= 75
    Status = 'Pass';
else
   Status = 'Fail';
end
 No = num2str(k);
 IMC = num2str(x);
dlmwrite('Version_1',[No    IMC    Status],'-append','delimiter','\t','precision','%.2f');  

end

[Guillaume]

As I wrote: As for x and areaRatio, since they're both scalar I have no idea how they're supposed to change in the loop

Since they're constant and IMC and Status only depend on them, then yes nothing is going to change.

I have no idea what you intended to do in that loop, but if you want the output to vary, you need to vary x and areaRatio in the loop.

[zhixuan hong]

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]

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.