# Need help with syntax and how to use sigma in matlab

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Mircea Mircea on 25 Apr 2022
Edited: VBBV on 25 Apr 2022
I don't know how to type Uan from my code below in matlab. It says ''Matrix dimensions must agree.''
This is what Im trying to type:
clear
close all
Z1=500
Z2=50
Z3=500
u=1
tau1=(2*Z2)/(Z1+Z2);
tau2=(2*Z1)/(Z1+Z2);
tau3=(2*Z3)/(Z3+Z2);
p1=(Z2-Z1)/(Z2+Z1);
p2=(Z1-Z2)/(Z1+Z2);
p3=(Z3-Z2)/(Z3+Z2);
T=2*10^-6
t=0:50*T/200:50*T
%I am stuck on Uan and F1
n=2:3:25
ua1=tau1*u.*(t>=0)
Uan=(tau1.*tau2.*(p3^n-1).*(p2^n-2).*u).*(t>=(n-1)*2*T)
F1=symsum(Uan,n,2,25)
figure(1)
plot(t,F1, 'DisplayName', 'F1')

VBBV on 25 Apr 2022
Edited: VBBV on 25 Apr 2022
clear
close all
Z1=500
Z2=50
Z3=500
u=1
tau1=(2*Z2)/(Z1+Z2)
tau2=(2*Z1)/(Z1+Z2)
tau3=(2*Z3)/(Z3+Z2)
p1=(Z2-Z1)/(Z2+Z1)
p2=(Z1-Z2)/(Z1+Z2)
p3=(Z3-Z2)/(Z3+Z2)
T=2*10^-6
t=0:50*T/200:50*T
%I am stuck on Uan and F1
n=linspace(2,25,length(t)) % change
ua1=tau1*u.*(t>=0)
Uan=(tau1.*tau2.*(p3.^n-1).*(p2.^n-2).*u).*(t>=(n-1)*2*T)
syms n % declare n as symbolic variable
F1=symsum(Uan,n,2,25)
figure(1)
plot(t,F1+ua1, 'DisplayName', 'F1')
Declare n as symbolic variable while using it in symsum. Make the length of vectors n and t equal.

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