Help with the erfc function

i am trying to use the ficks law which has erfc fuction and i am having trouble in defining the function.ERROR WHILE RUNNING THE ATTACHED CODE.THANK YOU IN ADVANCE!!!

Answer 1

[Ameer Hamza]

This is not a correct MATLAB syntax

erfc*(0.2/X3)

Function should be called like this

erfc(0.2/X3)

[DEWDROP]

.thanks.....it works but it gives answer which is out of range .so the prooblem is with the error function or what ?i am confused.

[Ameer Hamza]

I think this must be some other issues in the code. erfc() should be working fine.