Having different value for the same function

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mahmud kibria
mahmud kibria 2023-8-7
回答： Karan Singh 2025-2-1
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?
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Walter Roberson
Walter Roberson 2023-8-7
Are you sure you want to use the / operator and not the ./ operator ?

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回答（1 个）

Karan Singh
Karan Singh 2025-2-1
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?

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