# How to test a math function with different values of x?

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Austin Milliren on 5 Apr 2017
Edited: Jan on 5 Apr 2017
Hi all,
I am trying to take two math functions, (y and z) test them with 3 different values of x and print the results of each value in the two equations. I have made it so that I can test and print on of the values but I have not been able to modify my script to get it to test all 3 values and print the results. What I currently have follows:
%Clear command window and variables
clear
clc
%Naming Variables to make the equations cleaner
x = 1.2;
A = 3 * sin(x^3);
B = 4 * x + 3;
C = 2 * (x + 3);
D = exp(x) + 2;
E = 2 + 3 * x^3;
%Equations y and z, respectively
y = A./B;
z = C + (D./E);
%Print out the values of y and z
fprintf('For x=1.20 y is %0.06f, z is %0.06f', y, z)
This returns the following in the command window:
For x=1.20 y is 0.379873, z is 9.140551>>
Any help would be appreciated!

Jan on 5 Apr 2017
Edited: Jan on 5 Apr 2017
Move the equations into a function:
function [y, z] = Eqns(x)
A = 3 * sin(x^3);
B = 4 * x + 3;
C = 2 * (x + 3);
D = exp(x) + 2;
E = 2 + 3 * x^3;
y = A./B;
z = C + (D./E);
end
Now you can call this in a loop:
x = [1.2, 2.7. 3.1];
for k = 1:numel(x)
[y,z] = Eqns(x(k));
fprintf('For x=%.6f y is %.6f, z is %.6f\n', x(k), y, z);
end
'%0.06f' does the same as '%.6f' in sprintf.

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