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Best answer by LucMeekes

You've probably reached a point where alpha is outside of the range 20...1200. In that case your function SW(alpha) returns a NaN, which is NOT an array, so Ca(alpha), that tries to get the first element of SW(alpha) runs into this problem.

Note that it is not necessary to have SW(alpha) return 1-element vectors. I suspect you've typed square brackets around the expressions inside SW(alpha). You should never do that unless you explicitly want to produce a vector.

I suggest you change SW(alpha) to NOT use square brackets, and omit the transpose operator, like this:

LucMeekes_0-1645206641112.png

Then you're rid of the 'this should be a vector' error. In return you may have to deal with the fact that you are running into a NaN, which will cause NaN's to appear in the results of the Theta.at4 function.

 

Success!
Luc

2 replies

L
LucMeekes23-Emerald IVAnswer
23-Emerald IV
February 18, 2022

You've probably reached a point where alpha is outside of the range 20...1200. In that case your function SW(alpha) returns a NaN, which is NOT an array, so Ca(alpha), that tries to get the first element of SW(alpha) runs into this problem.

Note that it is not necessary to have SW(alpha) return 1-element vectors. I suspect you've typed square brackets around the expressions inside SW(alpha). You should never do that unless you explicitly want to produce a vector.

I suggest you change SW(alpha) to NOT use square brackets, and omit the transpose operator, like this:

LucMeekes_0-1645206641112.png

Then you're rid of the 'this should be a vector' error. In return you may have to deal with the fact that you are running into a NaN, which will cause NaN's to appear in the results of the Theta.at4 function.

 

Success!
Luc

    M
    MA_91215561-VisitorAuthor
    1-Visitor
    February 19, 2022

    Thanks! It works like butter 🤗

    S
    StuartBruff23-Emerald V
    23-Emerald V
    February 18, 2022

    I haven't got Prime Subscription, only Express, so I can't check.

     

    However, have you tried using a try-catch expression to look at what Ca is returning and the associated value of theta_a.t?  I notice that Ca returns NaN if alpha is out of bounds, and NaN[0 gives that error message.

     

    Stuart

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