How can I read from file with loop ?

Question

Dzhamshed 2012-8-7

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/45444-how-can-i-read-from-file-with-loop

Hello to all, I am trying to read data from excel file and each 10 second update and plot it. Here is the main part of my m-code, if smb need I can paste the whole code.

function [x,y] = readExcelColumns (fileName, xColNum, yColNum)
  a= xlsread(fileName);
  x=a(:,xColNum);
  y=a(:,yColNum)
function updateAxes (hObject, eventdata, handles)
xColNum = get(handles.popupmenuX, 'value');
yColNum = get(handles.popupmenuY, 'value');
fileName=handles.fileName;
inf = 1;
* for k=1:1000
[x,y] = readExcelColumns (fileName, xColNum, yColNum)
plot (handles.axes1,x,y)
pause (10);
if k==0
    break;
end
end*
function pushbuttonSTOP_Callback(hObject, eventdata, handles)
inf = 0;

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Sriram 2012-8-7

where you got stuck?

Dzhamshed 2012-8-7

OK, I have a file which updates each 20 sec, and I want to have a plot of some columns, I made a loop for reading file infinitly, but it plots just one time and no more... here is the whole code http://pastebin.com/encDs5XJ

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Answer 1

Sriram 2012-8-7

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在 MATLAB Online 中打开

plot axes is getting updated.. there is no issue on that ... make sure you have x an y variables updates....

   for i = 1:1:10
    x = rand(i);
    y =rand(i);
    plot(handles.axes1,x,y)
    title(i)
    pause(1)
   end

the above sample code (as you did for plot) works fine... so try to make sure whether x and y variables get updated , and also make the delay (pause(10)in your code ) to be minimal when you debug whch ll be helpful...!

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Dzhamshed 2012-8-7

I think x,y updates as I included the function, called [x,y] = readExcelColumns (fileName, xColNum, yColNum) in the loop, but whatever it doesn't update(((

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Answer 2

Dzhamshed 2012-8-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/45444-how-can-i-read-from-file-with-loop#answer_55594

Sriram, I think x,y updates as I included the function, called [x,y] = readExcelColumns (fileName, xColNum, yColNum) in the loop, but whatever it doesn't update(((