Why is my function not recognized?

Question

TheSaint 2024-2-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2080111-why-is-my-function-not-recognized

评论： Stephen23 2024-2-9

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.

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Stephen23 2024-2-9

"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.

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Answer 1

VBBV 2024-2-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2080111-why-is-my-function-not-recognized#answer_1405356

在 MATLAB Online 中打开

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

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TheSaint 2024-2-9

How would I call this from the command window?

Stephen23 2024-2-9

编辑：Stephen23 2024-2-9

在 MATLAB Online 中打开

"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).

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