Error when trying to run a function using a script file.

I had to create a function and then run that function using a script file. Both files are saved in the current working folder. And if I call the function in the command window it works.

the function code is:

function [ Ot,Or,R ] = prob1_fun( Ri,Ro,Pi,Po )
%Calculates the tangential and radial stresses of a cylinder as a function
%of R (the radius at the point to be analyzed)
% List of Variables:
% Ot = tangenential stress (psi)
% Or = radial stress (psi)
%  R = radius at point to be analyzed (in)
% Ri = inner radius of the cylinder (in) 
% Ro = outer radius of the cylinder (in) 
% Pi = pressure on inner surface of cylinder (psi) 
% Po = pressure on outer surface of cylinder (psi) 

%Constraints

R = linspace(Ri,Ro,((Ro-Ri)/0.1));  %R spans the distance between Ri and Ro at increments of one tenth the difference between Ri and Ro.

%Parameter Equations: Two more variables are created to make the code
%easier to comprehend and read. These variables simply break the code into
%two smaller equations that are defining parts in both stress calculations.
%They serve no purpose other than making the code easier to write and to
%read.

K1 = (Pi*(Ri^2) - Po*(Ro^2)) / ((Ro^2) - (Ri^2));  
K2 = ((Pi-Po)*(Ro^2)*(Ri^2)) / ((Ro^2) - (Ri^2));
%Final Stress Equations:
Ot = K1 + (K2 ./ (R.^2));  %tangenential stress (psi)
Or = K1 - (K2 ./ (R.^2));  %radial stress (psi)

end

the script code is:

%Variables:
% Ri = inner radius of the cylinder (in) 
% Ro = outer radius of the cylinder (in) 
% Pi = pressure on inner surface of cylinder (psi) 
% Po = pressure on outer surface of cylinder (psi)

%Defining Parameters:

Ri = 2;            %inches
Ro = 4;            %inches
Pi = 1000;           %psi
Po = 100;            %psi

%Calculations

 [Tangential_Stress,Radial_Stress,Radius_Analyzed] = probl_fun (Ri,Ro,Pi,Po);

and I get the following error when trying to run the script file in the command window of matlab:

>> run prob1_script
Undefined function 'probl_fun' for input arguments of type 'double'.

Error in prob1_script (line 29)
[Tangential_Stress,Radial_Stress,Radius_At_Point_Analyzed] = probl_fun (Ri,Ro,Pi,Po);

Error in run (line 64) evalin('caller', [script ';']);

Answer 1

[per isakson]

Lower case "L" is a tricky letter.

The name of your function is prob1_fun with the digit "1" and in the script you try to call probl_fun with the letter "l".