Matlab Error: Matrices must agree
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Hello,
I am programming the following function:
V = 500;
c2 = 10;
Pv = 1/V;
% IvLin = a1*v; %what is v?
% IvQuad = a2*v^2;
% PDvLin = c2/v; %linear?
% PDvQuad = c2/(v^2); %quad?
%%%%%%Solve for a1 or a2 %%%%%%%
% size(c2)
% size(V)
% size(Pv)
funequ2 = @(v) v*(c2/v)*(1/V);
size(funequ2)
Equation2 = integral(funequ2,0,V);
funequ1 = @(v) (a1*v).*Pv;
Equation1 = integral(funequ1,0,V);%what is the upperbound
syms a1
solve(Equation1 == Equation2
For some reason it is not solving anything because I keep getting the error that the matrices must agree. When I checked the size of my components, they are all the same (1,1). I don't understand what the problem is. Could someone kindly help and provide some insight? This seems like it should have very simple.
Kam
4 Comments
Answers (1)
Youssef Khmou
on 26 Mar 2013
hi,
a1 is unknown, but check this solution , although the code technically correct , the solution is empty :
%dbstop if error
V = 500;
c2 = 10;
a1=10;
Pv = 1/V;
funequ1 = @(v) v.*(c2./v)*(1/V);
f1=funequ1(1:0.1:10);
F1 = integral(f1,0.1);
funequ2 = @(v) (a1*v).*Pv;
f2=funequ2(1:0.1:10);
F2=integral(f2,0.1);
solve(F1 == F2)
3 Comments
Youssef Khmou
on 26 Mar 2013
In this case then :
SOL=solve('v*(c2/v)*(1/V)-(a1*v)*Pv=0','a1');
>> SOL
SOL =
c2/V/v/Pv
a1=c2/V/v/Pv
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