## Subtract values in a matrix

### Bob Choy (view profile)

on 17 Nov 2012

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 values, with the first values of the first line being "0", and the same amount of lines and columns

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]

## Products

No products are associated with this question.

### Matt J (view profile)

on 17 Nov 2012
```bsxfun(@minus,m(1,:),m);
```

Bob Choy

### Bob Choy (view profile)

on 17 Nov 2012

Thank you it worked!!! But can I do this using for's?

Matt J

on 17 Nov 2012

Sure, but why?

Bob Choy

### Bob Choy (view profile)

on 17 Nov 2012

Because we are using them in the project Im developing and I wanna be coherent but if thats too much trouble for you feel free not to bother, your have helped enough

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi