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What is wrong with my matlab codes? ( MATLAB) please help me!

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clear all;
clc
Vm=100;
Z=2;
angle_radians=pi*-0.5;
wt=0:0.01:(2*pi);
v=Vm*cos(wt);
Im=Vm/Z;
i=Im*cos((wt)-(angle_radians));
p=(v.*i);
pr=v*i*cos(angle_radians)*(1+cos(2*wt));
px=v*i*sin(angle_radians)*(1+sin(2*wt));
subplot(4,1,1);plot(wt,v,wt,i);title('v(t)=Vmcoswt,I(t)=Imcos(wt+-(-90)');
xlabel('time');
ylabel('voltage (volts) & Current (Amps)');
subplot(4,1,2);plot(wt,p);title('p(t)=v(t)i(t)');
xlabel('time (t)');
ylabel('power (Watts)');
subplot(4,1,3);plot(wt,pr);title('pr(t)');
xlabel('time (t)');
ylabel('pr(t)');
subplot(4,1,4);plot(t,i);title('px(t)');
xlabel('time (t)');
ylabel('px(t))');
grid;
I am trying to draw graphs about reactive power etc. What can be wrong with line 13 and matrix?

Accepted Answer

Pemendra Kumar Pardhi
Pemendra Kumar Pardhi on 31 Dec 2020
Please replace the all * with .* for element wise product
and in line no 31, you neet to replace t with wt

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