How can I read from file with loop ?

2012 8 7
3 个回答
3 次查看（30 天）

0 个投票

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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Azzi Abdelmalek
Azzi Abdelmalek 2012-8-7
i see you have a code, can you specify your problem?
Sriram
Sriram 2012-8-7
where you got stuck?
Dzhamshed
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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回答（3 个）

Sriram
Sriram 2012-8-7

0 个投票

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
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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Dzhamshed
Dzhamshed 2012-8-7

0 个投票

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(((

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Sriram
Sriram 2012-8-7
Though you call the function - try to check in the next xls file your x and y (rows and coloumns) getting updated or not....
Do you get any error?
Does the loop goes on ???
Are you able to open as many - xls files - as the loop proceeds ?
Dzhamshed
Dzhamshed 2012-8-7
No it is not getting updated( I tried by xlswrite();
Sriram
Sriram 2012-8-7
编辑：Sriram 2012-8-7
Fine... hope now you could solve it.... (xlsread will work fine)
Dzhamshed
Dzhamshed 2012-8-7
I didn't solve it, it doesn't work, as it was. Could you, please see my source code in order to help me?

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Dzhamshed
Dzhamshed 2012-8-8

0 个投票

Pls, can anyone help me with this??? (((

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