Error on Beta Theta Mach equation

Question

Evan Gehret 2023-12-14

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回答： Dyuman Joshi 2023-12-14

I am trying to turn the following code into the formula below but I'm not sure what I am doing wrong and keep getting an error. Could somebody fix this for me? Thank you

beta = 35; %example values

m = 2;

gamma = 1.4;

theta = atan((m^2*sin(beta)-1)/(m^2(gamma+cos(2*beta))+2));

File: btm.m Line: 4 Column: 36

Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

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Answer 1

Dyuman Joshi 2023-12-14

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在 MATLAB Online 中打开

You are missing a multiplication operator in between M1^2 and the bracket expression in denominator, see below -

Note that if you are providing beta in degrees, the trignometric functions used will also have to be the ones that use degree as input i.e. sind instead of sin.

beta = 35; %example values
m = 2;
gamma = 1.4;
%           v         v              V          v
theta = atand((m^2*sind(beta)-1)/(m^2*(gamma+cosd(2*beta))+2))
theta = 8.2124