Solve function with integration of function of variable

hi,

   I want to use solve function on integration of varible, but it is giving error like: 
"A and B must be floating point scalars".

The operation is like :

syms Y; solve(integral(@(x) exp(-x),0,T)==0.5);

Can you give suggestion to solve this (or) suggest me an alternative way. Thank you.

Answer 1

[Torsten]

Or so :

syms x T
T0=solve(int(exp(-x),x,0,T)-0.5==0,T);

?

Best wishes

Torsten.

[modem sudhakar]

Thank u Torsten.

Answer 2

[Andrei Bobrov]

Maybe so?

out = fzero(@(x)integral(@(y)exp(-y),0,x)-.5,.5);

[modem sudhakar]

Thank u Andrei.