problem about the qfunc

I input the following codes in Matlab,

syms x
solve(qfunc(x+0.05)+qfunc(x+0.05) == 0.0036)

There comes out an error: "The argument of the Q function must be a real array."

Sincerely Robin

Answer 1

[Star Strider]

It seems qfunc doesn’t work with symbolic variables.

However, all is not lost! You just have to create a version of qfunc that will work with them.

Like this:

syms x  
Q(x) = 0.5 * erfc(x/sqrt(2));  
z = solve(Q(x+0.05)+Q(x+0.05) == 0.0036)

that produces:

z =

2.861237726243005680993556752081

[Robin]

Done, thank you very much!

[Star Strider]

My pleasure!