How can I solve an equation that is logical?

Question

Lars Bosma 2019-2-22

回答： Prateek Rai 2020-6-19

For my question I will take the following standard script:

syms x
eqn = sin(x) == 1
solx = solve(eqn,x)    

Matlab sees eqn now as a 1x1 logical with a value of 0.

This should result in x = pi/2 however Matlab gives the following answer:

solx = x

Does anyone know how I can solve this?

madhan ravi 2019-2-22

use clear all and try again maybe?

Answer 1

Prateek Rai 2020-6-19

As per my understanding, you are trying to solve the equation sin(x)==1 and and having issue with variable "eqn"

You can try these two things:

(a) clear all

(b) declare eqn as sym:

syms eqn

You can refer to the following documentation for more details on “solve” function.