problem writing a seemingly easy summation
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hi everyone I have this matrix P and for each column j I need to have a summation from second row to end, or i=2:end
for example
P=[1 3 5 7;3 5 7 9;2 4 6 8];
now the matrix I am looking for is [5 9 13 17]
but no matter how I try to write it the answer is second row only
can someone help?
thank u in advance
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Adam
2014년 8월 15일
sum( P(2:end,:) )
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Adam
2014년 8월 15일
Can you paste in the whole Matlab commands with results output to command line? In the answer below you said it gave 34 so it sounds as though something odd is happening with your code or your Matlab.
I get exactly the same as Guillaume posted when I run this command.
sum (and most functions of that type) on a 2d matrix will, by default sum each column and give you a result which is 1-by-numColumns.
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