how to write this equation

Can someone help me write this equation. I am having problems with a bracket somewhere.Not getting the answer i needed.

Thanks

[Stephen23]

@sri satya ravi: please edit your question and show us the code that you wrote.

[sri satya ravi]

Cf = sqrt((2*gama*(r_cfv^((gama-1)/gama)-1))./(gama-1)*(beta^4-r_cfv^(-2/gama)))

Ndotref = 57.625; Z = 1; M_mix = 0.0287805; R = 8.314472; Venturi_Temp = 298.15; At = 0.01824; Venturi_pressure = 99132; gama = 1.399; beta = 0.8; r_cfv = 0.977;

the answer i am expecting for Cf is something close to 0.274.

[John BG]

Satya

is it possible to define vectors for r beta gamma?

[sri satya ravi]

Hi John,

I was just wondering why there is a need to define those constant values as vectors?

[sri satya ravi]

Hi Stephen Cobeldick,

I could figure out the equation. I got the result I was expecting.

Cf = sqrt((2*gama.*(r_cfv.^((gama-1)/gama)-1))./((gama-1).*(beta^4.-r_cfv.^(-2/gama))));

Thanks for the help.

[John BG]

good, you got to the result you wanted.

The adding of .^ ./ is what I meant

Now you can throw in vectors, as long as same length, and obtain numeric results, better than working with symbolic variables.

Regards

John

[e-mail]

Answer 1

[Stephen23]

I used y and B to make it easier to read:

num = 2*y*(r^((y-1)/y)-1)
den = (y-1)*(B^4 - r^(-2/y))
out = sqrt(num/den)

[John BG]

I bet Satya wants it for vectors

[Stephen23]

Probably, but they didn't tell us which values are vectors. Probably this is a good place to start reading:

http://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html