Why is my function not recognized?

function myEquation (x)

a = 0.4361836;

b = 0.1201676;

c = 0.937298;

r = (e^(-0.5*(x^2)))/(2*pi)

t = 1/(1+(0.3326*x))

phi = 0.5 - r*((a*t)-(b*(t^2))+(c*(t^3)))

fprintf('The value of  Φ(x) is: %i', phi)

fprintf('\n')

end

This is my current code. I am trying to use it to solve for the value of phi, and then print it. However, when I try to call it from the Command Window, it just says it is an unrecognized variable or function.

[Stephen23]

"However, when I try to call it from the Command Window, it just says it is an unrecognized variable or function."

Most likely:

• you have saved the function as a local function (i.e. after some other code in script or after another function),
• you have saved the Mfile somewhere that is not on the MATLAB Search Path.

Answer 1

[VBBV]

myEquation(2)

r = 0.0215

t = 0.6005

phi = 0.4909

The value of  Φ(x) is: 4.909191e-01

function myEquation (x)

a = 0.4361836;

b = 0.1201676;

c = 0.937298;

r = exp(-0.5*(x^2))/(2*pi)

t = 1/(1+(0.3326*x))

phi = 0.5 - r*((a*t)-(b*(t^2))+(c*(t^3)))

fprintf('The value of  Φ(x) is: %i', phi)

fprintf('\n')

end

[VBBV]

r = exp(-0.5*(x^2))/(2*pi)  % the variable e is not defined inside the function used to compute exponential

Replace undefined variable e with exp function

[TheSaint]

How would I call this from the command window?

[Stephen23]

"How would I call this from the command window?"

Like this:

myEquation(2)

What is probably more important is where you have saved that function:

• it must be the main function in an Mfile (i.e. it cannot be a local function or a nested function or part of a script),
• the Mfile must be on the MATLAB Search Path (simplest is to save it in the current directory).