numeric integral, symbolic function, whats wrong here?
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Stina Ravdna Lorås
il 19 Gen 2021
Commentato: Stina Ravdna Lorås
il 19 Gen 2021
I wonder why matlab wont solve this integral for me. Is it the variable t that is the problem? I tried to use vpa in case that was the problem, but it does not look like that was the case eiter. Could someone please help me out?
clc
clear all
syms t;
rho = exp(sin(t));
theta = 2*exp(sin(t));
phi = 3*exp(sin(t));
rho_dot = diff(rho);
theta_dot = diff(theta);
phi_dot = diff(phi);
func = sqrt(rho_dot.^2+rho.^2*theta_dot.^2+ rho.^2*phi_dot.^2*(sin(theta)).^2)
vpafunc = vpa(func);
dist01 = integral(vpafunc, 0, 1)
Error messages (and cmd window) is as follows:
func =
(exp(2*sin(t))*cos(t)^2 + 4*exp(4*sin(t))*cos(t)^2 + 9*sin(2*exp(sin(t)))^2*exp(4*sin(t))*cos(t)^2)^(1/2)
Error using integral (line 82)
First input argument must be a function handle.
Error in Modreg_Ov1 (line 20)
dist01 = integral(vpafunc, 0, 1)
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Risposta accettata
Stephan
il 19 Gen 2021
Modificato: Stephan
il 19 Gen 2021
clc
clear
syms t;
rho = exp(sin(t));
theta = 2*exp(sin(t));
phi = 3*exp(sin(t));
rho_dot = diff(rho);
theta_dot = diff(theta);
phi_dot = diff(phi);
func = sqrt(rho_dot.^2+rho.^2*theta_dot.^2+ rho.^2*phi_dot.^2*(sin(theta)).^2)
dist01 = vpa(int(func,0,1)) % Use int for symbolic integration
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