Sign in

Not a member? | Forgot your Password?

Search matlab

Search tips

Subscribe to matlab

Search tips

Free PDF Downloads

A Quadrature Signals Tutorial: Complex, But Not Complicated

Understanding the 'Phasing Method' of Single Sideband Demodulation

Complex Digital Signal Processing in Telecommunications

Introduction to Sound Processing

C++ Tutorial

Introduction of C Programming for DSP Applications

Fixed-Point Arithmetic: An Introduction

Cascaded Integrator-Comb (CIC) Filter Introduction

Discussion Groups

FFT Spectral Analysis Software

See Also

Embedded SystemsFPGA

Discussion Groups | Matlab DSP | ??? Undefined function or variable 's'.

Technical discussion about Matlab and issues related to Digital Signal Processing.


Post a new Thread

Is this thread worth a thumbs up?


??? Undefined function or variable 's'. - Zeinab Ghofrani - Jun 18 18:13:00 2004

Hello to all
I have a matrix called A, which contains some numbers. I want to add the symbol s to some of the elements of the matrix and then take the inverse laplace transform of the matrix. but I can't do it. It gives the error below:
??? Undefined function or variable 's'.
Error in ==> D:\MATLAB\toolbox\symbolic\@sym\double.m
On line 45  ==> D = reshape(eval(X),m,n);
Error in ==> D:\MATLAB\work\circuit.m
On line 124  ==>         if m~=0, y(m,m)=y(m,m)+s*element_value,end
The code I use is:
syms s
if m~=0
in which "element_value" and "m" are scalars defined beforehand.
I would appreciate it if somebody helps me.
Zeinab Ghofrani