multiple if elseif statement

How can solve this (using if and esleif statement)?

if lambda_theta <= 0

F_lambda_theta2 = 1 - ( (-12.986 * lambda_theta) -(123.66 * lambda_theta.^(2)) - (405.689 * lambda_theta.^(3)) ) * exp( -(Tu/1.5)^1.5 ) % lambda_theta2=<0

else

F_lambda_theta2 = 1 + 0.275 * ( 1 - exp( -35.0 * lambda_theta ) ) * exp ( -Tu/0.5 ) % lambda_theta2 > 0

end

% Re_theta2

if Tu <= 1.3

Re_theta2 = ( 1173.51 - 589.428 * Tu + ( 0.2196/(Tu^2) ) ) .* F_lambda_theta2

else

Re_theta2 = 331.50 * ( Tu - 0.5658 ) ^ (-0.671) * F_lambda_theta2

end

[David Hill]

Show us your code and ask a specific question.

[MarKf]

yeah you got it

[Walter Roberson]

is lambda_theta a scalar or potentially a vector?

Answer 1

[Rohit]

You can refer to the below documentation links of ‘if else statements’ to get you started with implementation. This also has some examples.

https://www.mathworks.com/help/matlab/ref/if.html

In order to get a better understanding of Element operations and array vs matrix operation and get clarity on the difference between them, you can refer to the below documentation links. Based on your use case, you can use either ‘*’ or ‘.*’ .

https://www.mathworks.com/help/matlab/ref/times.html?searchHighlight=Element-by-element%20operations

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