Loop of two variables

I want to measure effect of pressure and temprature on Density so

-I want to calculate first the effect of pressure on density at fixed temprature (for example density values for pressure ranges from 100 to 1000 psia at 60 F)

• Then I want to repeate the same but at other temprature

Example of code

A=100
P=100:1000
Pc=1076
Tc=400
T=100:1000 %
for i =1:length(100)
    pr(i)=(P(i)/Pc) %function of pressure
    tr= T/Tc  % this parameter function on temp
    p=(pr(i)+tr;

This code run correctly if T= one value

but i want to repeat the same but at Temprature range from 100:1000

Answer 1

[KSSV]

A=100 ;
P=100:1000 ; 
Pc=1076 ;
Tc=400 ;
T=100:1000 ;%

[P,T] = meshgrid(P,T) ; 
pr = P/Pc ; 
tr = T/Tc ;
p = pr+tr ; 

surf(P,T,p)
shading interp