Trying to multiply these matrices and getting error "Dimensions of arrays being concatenated are not consistent."

clear all 
close all
clc

Xqs = 0.051; Xds = 0.051; Xmd = 0.0483; Rs = 0.055;
delta = 35;
iqds =  [Rs,Xqs;-Xds,Rs];
Ifd = 0:500;
po = 6;
vll = sqrt(2/3)*208;
vm = sqrt(2/3)*vll; 

vqs = vm*cos(delta);
vds = -vm*sin(delta);

E = Xmd*Ifd;
vqs_ = vqs - E;
V = [vqs_;vds];
I_out = inv(iqds)*V;

iqs = I_out(1,:);
ids = I_out(2,:);

P = (3/2).*(vqs.*iqs+vds.*ids);
Q = (3/2).*(vqs.*iqs-vds.*iqs);
T = (3.*po.*Xmd.*Ifd.*iqs)./4;

plot(P,Ifd)
grid on

------------------Command Window

Error using vertcat

Dimensions of arrays being concatenated are not consistent.

Error in Project_3 (line 146)

V = [vqs_;vds];

Answer 1

[the cyclist]

vqs_ is a 1x501 vector. You can't concatenate the scalar vds to it vertically, which is what you are trying to do.

[Christopher Rodriguez]

Thank you! I appreciate the response