Prev: CSVREAD issue: How to treat characters?
Next: finding nearest value in 2D arrays
From: Mike Schalla on 8 Feb 2010 13:04
Hi,
I need to plot the volume of a sphere (V=(4/3)pir^3) with the radius
bounds being from .1 to 10. Everytime I run it I always get this
error. I just can't get it to work so please help

x = .1:.1:10;
y= x^3*pi*4/3;
plot(x,y)

??? Error using ==> mpower
Matrix must be square.


-mike
From: Steven Lord on 8 Feb 2010 13:15

"Mike Schalla" <mschalla18(a)gmail.com> wrote in message
news:ebafed88-8142-49c3-9295-a188a03ca74b(a)m31g2000yqb.googlegroups.com...
> Hi,
> I need to plot the volume of a sphere (V=(4/3)pir^3) with the radius
> bounds being from .1 to 10. Everytime I run it I always get this
> error. I just can't get it to work so please help
>
> x = .1:.1:10;
> y= x^3*pi*4/3;
> plot(x,y)
>
> ??? Error using ==> mpower
> Matrix must be square.

You're only raising one matrix to a power here. Is that matrix square? No,
it isn't.

x^3 is essentially equivalent to x*x*x and for that multiplication to be
defined, x must be square.

Now x.^3, on the other hand, is essentially equivalent to x.*x.*x and all
that requires is that x exist.

The * operator perform matrix multiplication; the .* operator performs
elementwise multiplication.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ


 | 
Pages: 1
Prev: CSVREAD issue: How to treat characters?
Next: finding nearest value in 2D arrays