How to fix Error using * Inner matrix dimensions must agree.? the error is in this line : Ptotal=(1/​(2*pi))*su​m(P(i)).*e​xp(1i*omeg​a*t);

pas = 1/1000;

t=-10:pas:10;

t0 = 0; %deplasarea por?ii

A = 1;

p1= poarta(-A/2,A/2,1,t-t0);

p2=poarta(-A/2,A/2,1,t-t0);

figure(1);

subplot(2,1,1);

plot(t,p1), title('Poarta 1');

subplot(2,1,2);

plot(t,p2), title('Poarta 2');

k=10;

omega = -k*pi/A:1/10:k*pi/A;

P1 = zeros(1,length(omega));

for i=1:length(omega)

P1(i) = integral(@(t)poarta(-A/2,A/2,1,t-t0).*exp(-1i*omega(i)*t),-100,100);

re = real(P1(i));

im = imag(P1(i));

if abs(re)<10^-10

re = 0;

end

if abs(im)<10^-10

im = 0;

end

P1(i) = re+1i*im;

end

figure(2);

subplot(2,1,1);

plot(omega,abs(P1)), title('Parte reala P1');

subplot(2,1,2);

plot(omega,angle(P1)), title('Parte imaginara P1');

figure(3);

plot3(omega,real(P1),imag(P1));

title('Poarta 1');

xlabel('Frecventa unghiulara');

ylabel('Partea reala');

zlabel('Partea imaginara');

P2 = zeros(1,length(omega));

for i=1:length(omega)

P2(i) = integral(@(t)poarta(-A/2,A/2,1,t-t0).*exp(-1i*omega(i)*t),-100,100);

re = real(P2(i));

im = imag(P2(i));

if abs(re)<10^-10

re = 0;

end

if abs(im)<10^-10

im = 0;

end

P2(i) = re+1i*im;

end

figure(4);

subplot(2,1,1);

plot(omega,abs(P2)), title('Parte reala P2');

subplot(2,1,2);

plot(omega,angle(P2)), title('Parte imaginara P2');

figure(5);

plot3(omega,real(P2),imag(P2));

title('Poarta 2');

xlabel('Frecventa unghiulara');

ylabel('Partea reala');

zlabel('Partea imaginara');

for i=1:length(omega)

P(i)=P1(i)*P2(i);

end

Ptotal=(1/(2*pi))*sum(P(i)).*exp(1i*omega*t);

%The problem seems to be on the last row. Error using * Inner matrix dimensions must agree.

%I've tryed to put .* everywhere * is, but the error persists. How can i fix it?

Answer 1

[madhan ravi]

P=P1.*P2; %remove the last loop
Ptotal=(1/(2*pi)).*sum(P).*exp(1i.*omega.*t);

[Florea George]

I still get the same error that matrix dimensions must agree

[madhan ravi]

Try the below and show what it shows after running the entire code.

size(t)
size(P)

[Florea George]

still an error

[madhan ravi]

Oh man ..., put those in command window not inside the script.

[Florea George]

>> size(t)

size(P)

ans =

1 20001

Undefined function or variable 'P'.

>>

%Sorry. Its been a long day for me. thanks for helping me despite my lack of attention

[Florea George]

Any other solution?