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Topic: Subtract values in a matrix
Replies: 6   Last Post: Nov 19, 2012 12:20 AM

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Steven Lord

Posts: 17,944
Registered: 12/7/04
Re: Subtract values in a matrix
Posted: Nov 19, 2012 12:20 AM
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"Bob Ferreira" <migmick2000@hotmail.com> wrote in message
news:k88nie$f7r$1@newscl01ah.mathworks.com...
> Hi there!
>
> I need really need some help on this,
> I have a matrix which has "L" lines and "C" columns. I want to subtract
> each value in the matrix by the value the first value in the first line of
> its column, and give me a matrix with those value, with the first values
> of the first line being "0".
>
> Example: m = [2,2,2;3,3,3;4,4,4] the matrix given should be
> [0,0,0;-1,-1,-1;-2,-2,-2]
>
> I hope I made myself understood, if not, please ask away.
>
> Thank you for your time.


m = [2,2,2;3,3,3;4,4,4];
m2 = bsxfun(@minus, m(1, :), m)

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Steve Lord
slord@mathworks.com
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