A symbolic expression problem (different results in different version)

4 views (last 30 days)
Hi, :
May I ask, I have a m-file, the content is as below, but it ran out different result in different versions of Matlab, they are 2013b & 2019a, or say, it's originally built in 2013b, but while migrating to 2019a on the other platform, it failed.
Can anyone know why, and how to solve it ? I found the issue was caused by the simple(), and the ezsym.m provided by the mathwork contributor.
The complete URL is here :
Thank you very much.
The code is here:
syms t a
fun = sin(a*t)
fun = sin(t)^2
fun = sin(t^2)
fun= 1/2 * ( exp(i*t^2) - exp(-i*t^2) )
A = laplace(fun)
% ezsym() was from Mathwork community contributor
% refer to: https://www.mathworks.com/matlabcentral/fileexchange/51195-ezsym-display-symbolic-expression-in-blank-plot
% simple() in Matlab2013b is ok, but failed at 2019a
syms s y(s)
y(s) = A
Num_Y = y(2*pi*1e4)
N_Sol = simple(Num_Y)
N_abs = double(abs(N_Sol))
N_angle = double(angle(N_Sol))

Accepted Answer

Walter Roberson
Walter Roberson on 22 Apr 2020
simple() was removed as of R2015a. Use simplify() instead.

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by