Having different value for the same function

I have a simple function

P_MCH = [0.20598017,0.270460009,0.313455273];
P_TOL = [0.20598017,0.270460009,0.313455273];
P_H2 = [4.58803966,4.459079983,4.373089453];
Rp = @(p) p(1)* p(2)*P_MCH.*(1-P_TOL.*P_H2.^3/(P_MCH*316.8159);

While running the Rp is calculated as 0.74409.

In excel it is 0.715944

Can you help?

[Davide Masiello]

What are the values of p(1) and p(2)?

Also, what do you want do do with the arrays?

It seems you'd want to do operations element by element and then sum?

[Walter Roberson]

Are you sure you want to use the / operator and not the ./ operator ?

[Aditya]

Can you provide the values of p(1) and p(2)?

Answer 1

[Karan Singh]

HI @mahmud kibria

Looks like your equation is missing parentheses, and now that I think about it, Excel might handle calculations differently—like summing the numerator and denominator before dividing. MATLAB gives 0.74409, probably because it's using matrix division (/) instead of element-wise division (./), which changes how the calculation works and introduces a scalar value. Meanwhile, Excel gives 0.715944, which makes sense if it's actually doing element-wise division and summing things correctly. So yeah, maybe the equation formatting is the issue?