Error Messages, dimension and plot2cart (Matlab)
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Hi the following script gives back the errors.But im not sure why
"Error using .* Matrix dimensions must agree.
Error in pol2cart (line 22) x = r.*cos(th);
Error in SurfPlotQ1 (line 18) [x,y]= pol2cart(th,r);"
function graph=plot(c,P,rd,E,t,nu,K,w,y,r,th) ;
c=15;
P=15;
rd=15;
E=18*10^6;
t=0.08;
nu=0.3;
th=meshgrid(0:0.1:2.*pi);
w=meshgrid(0:0.1:rd);
r=meshgrid(0:0.1:rd);
[x,y]= pol2cart(th,r);
K= (E*t^3)/(12*(1-nu^2));
w=((P.*rd.^4)./(64.*K)).*(1-(r./rd).^2).^2+c;
mesh(x,y,w);
colorbar
end
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Answers (1)
Star Strider
on 6 Oct 2014
Edited: Star Strider
on 6 Oct 2014
Use the linspace function to generate the arguments to meshgrid to calculate ‘th’, ‘w’, and ‘r’. That way you can specify all of them to have the same lengths. That will avoid the error you’re getting.
4 Comments
Star Strider
on 6 Oct 2014
The third argument to linspace is the length of the vector you want it to create. You’ve asked it to create a scalar with a lenght of 1, and it did!
Change the linspace calls to:
th=meshgrid(linspace(0,2*pi,100));
w=meshgrid(linspace(0,rd,100));
r=meshgrid(linspace(0,rd,100));
and it works.
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