# How to create a matrix using two arrays (x & y) and a formula that uses x & y

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Thomas Pruchinski on 3 Oct 2021
Commented: the cyclist on 4 Oct 2021
So if
x = [4.0:-.05:3.7]
&
y = [9;15;21;27;33;39;45]
&
z = 1.3473*152/(152+y)+(5-x)*y/(152+y)
How do I create a matrix that calculates output z at the different possible combinations of x & y?

Matt J on 3 Oct 2021
Edited: Matt J on 3 Oct 2021
Use implict expansion.
x = [4.0:-.05:3.7] ;
y = [9;15;21;27;33;39;45];
z = 1.3473*152./(152+y)+(5-x).*y./(152+y)
z = 7×7
1.3279 1.3307 1.3335 1.3363 1.3391 1.3419 1.3447 1.3161 1.3206 1.3251 1.3296 1.3341 1.3386 1.3431 1.3051 1.3112 1.3173 1.3234 1.3294 1.3355 1.3416 1.2949 1.3025 1.3100 1.3175 1.3251 1.3326 1.3402 1.2853 1.2943 1.3032 1.3121 1.3210 1.3299 1.3389 1.2764 1.2866 1.2968 1.3070 1.3172 1.3274 1.3376 1.2680 1.2794 1.2908 1.3022 1.3137 1.3251 1.3365
Thomas Pruchinski on 4 Oct 2021
This worked easy.Thanks.

the cyclist on 3 Oct 2021
Use the meshgrid function to create 2-dimensional grids from the x and y vectors. The first example in the documentation is very similar to what you want to do.
the cyclist on 4 Oct 2021
Guessing you used / instead of ./

R2021b

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