how to use a function with multiple inputs for a parameter?

Question

Rodrigo Luiz 2021-7-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/870263-how-to-use-a-function-with-multiple-inputs-for-a-parameter

回答： Walter Roberson 2021-7-2

Hi everyone, I'm trying to use this mathematica script (from Smith, J. M. (1950). Introduction to chemical engineering thermodynamics.) in Matlab. It isn't a complex script, but a I want to vary the temperature parameter (t) and obtain the fugacities coefficients for each temperature. How can I do this?

That's the function that I'm using in matlab:

function phi = phib(t, p, tc, pc, omega)
pr = p/pc; 
tr = t/tc; 
b0 = 0.083 - 0.422/tr.^1.6; 
b1 = 0.139 - 0.172/tr.^4.2; 
phi = exp( (b1*omega + b0)*pr/tr );
end

So, I use the file exeBolT.m to calculate the fugacity (phi)

clear all; close all; clc
t = [323.15; 400];
p = 0.25;
tc = 535.5;
pc = 41.5;
omega = 0.323;
phi = phib(t, p, tc, pc, omega)

Then, when I execute the file, I obtain

Error using  / 
Matrix dimensions must agree.
Error in phib (line 8)
phi = exp( (b1*omega + b0)*pr/tr );
Error in exeBolT (line 9)
phi = phib(t, p, tc, pc, omega)