conversion frm sym to double is not possible?
조회 수: 2 (최근 30일)
이전 댓글 표시
clc;
clear all;
g_db=[0:1:40];
g=10.^(g_db/10);
c=1;
syms y
%g=0:0.1:10;
alpha=1;
p=0.5*((g)+exp(-g.*y));
q=((y.^(alpha-1)).*exp(-y./c))/((gamma(alpha))*(c^alpha));
r=p*q;
semilogy(g_db,r,'o')
hold on
답변 (1개)
Walter Roberson
2015년 8월 22일
Your y is a symbol. p uses y so p is symbolic. q uses y so q is symbolic. Two symbolic values multiplied together is going to be symbolic. Therefore r is symbolic.
You then try to semilogy() with the second argument being that symbolic r. semilogy is not able to plot symbolic results.
In order to plot something that is in symbolic form, all of the symbolic variables in the expression must be given specific numeric values. For example,
semilogy(g_db, double(subs(r,y,linspace(0,1,20)), 'o')
댓글 수: 0
참고 항목
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!