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How to read data from xls file in loop?

Asked by Shashank Katiyar

Shashank Katiyar (view profile)

on 30 Jan 2013

I have one matrix("dummy") with some data in it. I want to sort that data and append it in a matrix which already has some data in it according to the relation satisfied by data. For that I want to run a loop which will read data and check the condition and then append it in the corresponding cell of file. I have written following code.

offset = ['A' 'B' 'C' 'D' 'E' 'F' 'G' 'H' 'I' 'J' 'K' 'L' 'M' 'N' 'O' 'P' 'Q' 'R' 'S' 'T' 'U' 'V' 'W' 'X' 'Y' 'Z']; maxload = 0; index_1 = 0; index_2 = 0; alpha = offset(1); temp = dummy(1,1); N_offset = 1; for i = 1:n(1,1) for j = 1:m(1,1) if(temp >= dummy(j,i) && maxload <= 100) temp = dummy(j,i); index_1 = i; index_2 = j; end maxload = maxload+delnode(4,i); %add condition for delivery node also end for k = 1:m(1,1) columnB = xlsread('cluster.xls',1,'B%d',N_offset); N_offset = N_offset+1; if (index_2 == k) xlswrite('cluster.xls', delnode(:,index_1), 1, sprintf('%c1',(alpha))); alpha = offset(1+k); end end end

But I get the following error.

Warning: Import mode string is invalid. XLSREAD resets mode to normal. > In xlsread at 170 In VRP_ver2 at 73 Error using xlsreadCOM (line 48) Data range is invalid.

Error in xlsread (line 230) [numericData, textData, rawData, customOutput] = xlsreadCOM(file, sheet, range, Excel, customFun);

Error in VRP_ver2 (line 73) columnB = xlsread('cluster.xls',1,'B%d',N_offset);

Please help me in resolving this issue.

Thank You Shashank Katiyar

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Shashank Katiyar

Shashank Katiyar (view profile)

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2 Answers

Answer by Jing

Jing (view profile)

on 30 Jan 2013

Could you please format your code? it's hard to read!

The error is in xlsread line (line 73), for 'B%d', I think you should write ['B' num2str(N_offset)] in this line.

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Jing

Jing (view profile)

Answer by Image Analyst

Image Analyst (view profile)

on 30 Jan 2013

You can't do this:

xlsread('cluster.xls',1,'B%d',N_offset);

You need to create the cell reference as a string, for example with sprintf():

cellReference = sprintf('B%d', N_offset);
columnB = xlsread('cluster.xls',1, cellReference);

I don't know how many times you're calling xlsread, but if it's more than 2 or 3 times, you really should consider using ActiveX. It will be A LOT faster since you will only launch and shut down Excel once instead of with every call to xlsread().

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Image Analyst

Image Analyst (view profile)

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