reading a matrix in matlab

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fereshteh izadi
fereshteh izadi 2016-1-11
评论： Star Strider 2016-1-12
hello, I have a matrix like below
> head(mat[,1:4])
AT1G01060 AT1G01170 AT1G01180 AT1G01260
AT1G01060 1.0000000 0.3193360 0.6272994 0.2658624
AT1G01170 0.3193360 1.0000000 0.3178880 0.3588030
AT1G01180 0.6272994 0.3178880 1.0000000 0.2542234
AT1G01260 0.2658624 0.3588030 0.2542234 1.0000000
AT1G01380 0.6178751 0.1561297 0.7052692 0.3252033
AT1G01490 0.5990499 0.6129301 0.6424225 0.5727253
>
how I can read that as a matrix to run as an input of my code. I attached my code thank you for your help
  1 个评论
Star Strider
Star Strider 2016-1-12
You attached the code but not the file you are reading. Attaching ‘ND.m’ is not relevant because it apparently wants the matrix you want to read as its input argument.
I provided a textscan call to read your file (as best I could, considering I do not have your file to work with). Have you used it? Did it work?

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回答（1 个）

Star Strider
Star Strider 2016-1-11
You did not attach your code. If this is a text file, please attach the file as well.
The easiest way to import it as a text file would be to use the textscan function.
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fereshteh izadi
fereshteh izadi 2016-1-12
sorry file is too big to be attached but as i pasted above, my file is a correlation matrix with diagonal=1 and rownames and colnames are my genes and nrow=ncol but i dont know how to read my file
Star Strider
Star Strider 2016-1-12
See if this works:
Ngenes = 20; % Insert Correct Value Here
datacell = textscan(fid, ['%*s' repmat('%f',1,Ngenes)], 'HeaderLines', 1, 'CollectOutput',1);
datamatrix = cell2mat(datacell);
The '%*s' tells textscan to skip over the first (string) column. The repmat call duplicates the '%f' format descriptor for the number of genes that are in your correlation matrix. The cell2mat call should then work, since ‘datacell’ will have only numeric values.
I cannot test this without your file, but it should work.

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