empty sym: 0-by-1.

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omid ghorbani 2019-6-9

评论： Sonja Glas 2019-10-16

i want to solve a equation in a algorithm. this equation is ('x-sin(x)=b') .in this equation 'b' calculated of previous step. for example b=0.45.

when i run this, the answer is empty sym: 0-by-1.

but when I run (x-sin(x)=0.45) the answer is correct, means that this equation has numeric answer.

please help me to run this algorithm.

b=0.45
solve('x-sin(x)=b')

ans=

empty sym: 0-by-1

solve('x-sin(x)=0.45')

ans=1.4416

Steven Lord 2019-6-9

Don't pass a char vector into solve. Build a symbolic equation and pass that into solve.

syms x
b = 0.45;
eq = x-sin(x) == b
sol = solve(eq)

omid ghorbani 2019-6-10

thank you so much.

this answer is a 1*1 symbol. how can i chang this answer to double type.

Sonja Glas 2019-10-16

It should work with vpasolve instead of solve

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