Extracting coefficients of 'sinwt', 'coswt', sin2wt etc from a symbiolic expression.

5 views (last 30 days)
Hello,
I am having a mathmatical symbolic expression and want to extract the coefficient of 'sinwt', 'coswt', 'sin2wt' and so on.
For e.g. the expression is,
where, , and are symbolic variables. Now, is there anyway to get the coefficient of 'sinwt', 'coswt', 'cos3wt' etc. from this expression ? or in other words, is it possible to get the following desired output ?
  5 Comments
Yugal Gupta
Yugal Gupta on 9 Aug 2021
In the end, I added the following code and it gives me the desired output.
combine(ysincoss,'sincos')

Sign in to comment.

Answers (1)

Gargi Patil
Gargi Patil on 12 Aug 2021
Hi,
My understanding is that you would like to extract the coefficients of a symbolic trigonometric expression. The function "coeffs" can be used to return coefficients of an expression with respect to a specified term as follows:
syms a b c x
expr = a*sin(x)*b*sin(2*x) + c*sin(x);
[csin, tsin] = coeffs(expr, [sin(x), sin(2*x)])
csin = 
tsin = 

Community Treasure Hunt

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

Start Hunting!