Error using csvread to import massive excel file

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Colin Gilbert
Colin Gilbert 2015-11-26
评论： per isakson 2015-11-26
I am using csvread to open a excel file in segments because the original file is too large to open in excel. I can open the first portion of the file with the following code:
% determine the number of data points
datapoints = 250000;
nc = 54;
% Calculate the range of data removed frome the csv file
r1 = 4;
r2 = ((datapoints*nc)+r1);
c1 = 0;
c2 = 0;
%gather data from csv file
data1 = csvread(file,r1,c1,[r1,c1,r2,c2]);
However when I manipulate the variables to carry on to the next portion of data using the following code:
% determine the number of data points
datapoints = 100000;
nc = 54;
% Calculate the range of data removed frome the csv file
r3 = ((datapoints*nc)+r2);
c1 = 0;
c2 = 0;
%gather data from csv file
data2 = csvread(file,r2,c1,[r2,c1,r3,c2]);
I get the following error:
??? Error using ==> dlmread at 145 Badly formed format string.
Error in ==> csvread at 54 m=dlmread(filename, ',', r, c, rng);
Error in ==> programtest2 at 51 data2 = csvread(file,r3,c1,[r3,c1,r4,c2]);
Is there a way to solve this issue? Thank you
  1 个评论
per isakson
per isakson 2015-11-26
How large is the file? In your last question you mentioned 1GB. A 1GB csv-file shouldn't be a problem with Matlab. Is it pure numeric?

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