syntax error for matrix

I get the error on the first open bracket, here's the code.

close all; clear all;

syms s V;

A = [3+2+1*s 1*s+2 -3; -s-2 2+1*s+2*s+4*s -2*s; -3 -2*s 3+(1/(2*s))+2s];

B = [V;0;0];

[I]=linsolve(A,B);

Answer 1

[Star Strider]

Typo:

A = [3+2+1*s 1*s+2 -3; -s-2 2+1*s+2*s+4*s -2*s; -3 -2*s 3+(1/(2*s))+2s]

↑ ← MISSING MULTIPLICATION OPERATOR

Correct that, and it runs without error —

syms s V 
sympref('AbbreviateOutput',false);
A = [3+2+1*s 1*s+2 -3; -s-2 2+1*s+2*s+4*s -2*s; -3 -2*s 3+(1/(2*s))+2*s];
B = [V;0;0];
[I]=linsolve(A,B)

I = 

.

[Thomas O'Reilly]

That was fast. Thank you. That got rid of the syntax error but it isn't giving me any output. You know any reason that would happen?

[Star Strider]

My pleasure!

It gives me output (as demonstrated), so I guess that depends on the definition of ‘output’.

Numeric output would require that the functions be evaluated at one (or more) values of the Laplace variable s with specific values of V, although that may be variable as well (for example an A-C voltage source, although that could be modeled by a Laplace transform as well).

Simplifying them may provide some benefit —

syms s V 
sympref('AbbreviateOutput',false);
A = [3+2+1*s 1*s+2 -3; -s-2 2+1*s+2*s+4*s -2*s; -3 -2*s 3+(1/(2*s))+2*s];
B = [V;0;0];
[I]=simplify(linsolve(A,B), 500)

I = 

However I’m not certain that provides much additional clarity.

This is the best I can do.

.

[Thomas O'Reilly]

My output shows the file name and then gives me nothing else? I didn't use the simplify command or the sympref line either.

[Thomas O'Reilly]

It works with simplify, so thanks again. But how do you get the output look so nice?

I =

(V*(20*s^3 + 50*s^2 + 19*s + 2))/(24*s^4 + 172*s^3 + 184*s^2 + 89*s + 14)

(V*(4*s^3 + 26*s^2 + 13*s + 2))/(24*s^4 + 172*s^3 + 184*s^2 + 89*s + 14)

(2*V*s*(2*s^2 + 25*s + 6))/(24*s^4 + 172*s^3 + 184*s^2 + 89*s + 14)

[Star Strider]

The typeset (LaTeX) output is the default here with the online Run feature. The same is also possible using the Live Editor (that I use occasionally), or by using the latex function and then a LaTeX interpreter. See The (Not So) Short Introduction to LaTeX2e - lshort.pdf for more details on LaTeX.