A symbolic expression problem (different results in different version)
2 views (last 30 days)
Show older comments
Tamura Kentai
on 22 Apr 2020
Edited: Walter Roberson
on 25 Apr 2020
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)
laplace(fun)
fun = sin(t)^2
laplace(fun)
fun = sin(t^2)
laplace(fun)
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
ezsym(A,26)
% simple() in Matlab2013b is ok, but failed at 2019a
simple(A)
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))
0 Comments
Accepted Answer
Walter Roberson
on 22 Apr 2020
simple() was removed as of R2015a. Use simplify() instead.
7 Comments
Walter Roberson
on 23 Apr 2020
Edited: Walter Roberson
on 25 Apr 2020
it is implemented in Firefox and safari. Some work is underway to add it to Chrome
More Answers (0)
See Also
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!