Summing across columns

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discoduck
discoduck 2011-2-17
I have some data containing 33 columns. I need to sum across columns 2:33 and then plot against the first column. Any ideas?

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回答（2 个）

Matt Tearle
Matt Tearle 2011-2-17
Just a simplification to Paulo's version -- "plot against the first column" means plot the sum as y and the first column as x:
a=rand(10,33)
b=sum(a(:,2:end),2)
plot(a(:,1),b)
Paulo Silva
Paulo Silva 2011-2-17
clf %clear a figure
hold on %additive plotting
a=rand(10,33) %generate some random data
b=sum(a(:,2:end),2) %do the sum of columns of a from 2 to the last one
plot(a(:,1)) %plot the first column in blue
plot(b(:,1),'r') %plot the sum of the columns in red
title('The sum of columns for 2 to 33 is the red line')
xlabel('The first column is the blue line')

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