Different result between Matlab and mobile calculator. (Plz helpTT)

This function is designed to calculate a "Loss Factor" of Elbow in the pipe equipment consisted of Venturi meter, Orifice meter and Rotameter.

and the input data is like pictures below.

and the output from matlab is [-0.0720, 1.3425, 0.7478].

But it was a quite weird conclusion for me so I recalculated it by mobile calculator.

And my calculator made a result of -1.1168 for the first element of the matrix.

-0.0720 and -1.1168 are quite different from each other but I couldn't find what is the problem.

Though there was some strange results above this one, it is too large number so I can't tolerate it.

Plz take a look for my code and find some errors for me.TT

Answer 1

[Durganshu]

Clearly, you have misplaced any bracket or operator while solving the problem in the calculator. Look for them.

I t could even be possible that you have written the equation in a wrong way. Please recheck the hand equations and teh equations written in the script.

The result would be same if there are no misplacements.

[Durganshu]

Well, I just wrote the code and got the output as -1.1168 for the first element.

Here's the code:

function K_Elb =Loss(hA, hB, hG, hH)
delta_H = (hG-hH) + ((-1.83)*0.167*(hA-hB))/16;
vel_H = (0.167*(hA - hB))/16;
K_Elb = (delta_H)./vel_H;
end

Inputs:

hA = [0.3007 0.3300 0.3753];
hB = [0.2280 0.2293 0.2267];
hG = [0.2220 0.2190 0.2113];
hH = [0.2207 0.2157 0.2073];

Output:

K_Elb =

   -0.1168    1.3097    0.7490
  

[Kang san Lee]

I still can't understand what is the problem...You and I just made a perfectly same code;;

The picture above is just what I made for data processing. And there is no other complicated orders, but only listing the functions. I can't understand where I made a wrong code. Both of yours and mine are totally same...

[Durganshu]

Try using clearvars in order to clear all the stored variables and then re-execute the program. Problably your memory could be having some garbage values and processing them.

[Durganshu]

P.S.: Please don't post pictures. Either post it in textual format or in the format of a code.

[Kang san Lee]

Ah, sorry for posting pictures. It can be a rude attitude in questioning. umm...I always pressed "clear, clc" before executing the script. I think there can be a probability variables have garbage values in it as you said, but there's no solution for it...Anyway thank you for answering my posting. If you notice what's wrong with my code, please answer me anytimeTT. I will agonize for this problem more.

[Durganshu]

Your output values seem to be Q1, Q2, Q3, K_Ven, K_Dif, K_Ori, K_Elb. Are you getting all these values incorrect?

[Rik]

Just a quick note: if you Mark an answer as accepted, that means your issue is solved, which will decrease the number of people looking into your question.