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Solve on...

ValeryOchkov
24-Ruby IV

Solve on...

cos.png

2 REPLIES 2

 

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The possibilities to solve for a function instead of a variable are VERY limited (not worth using IMHO)

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LucMeekes
23-Emerald III
(To:Werner_E)

Other than for documentational purposes, there's no reason to solve for a function, such as f(x). The important part is what you do with the result of the (symbolic) solution.

Note that f(x) need not be defined before using it in a symbolic solve. It's better when it's not defined.

But you can even 'solve for f(x,y)' if you need a function of more variables.

The symbolic solutions below all cause f to be defined as a function of two variables.

LM_20190923_SolveOn.png

Bottom line: the symbolic solve operation solves for a symbol. Whether that symbol is a simple variable, or a function with parameters doesn't matter. Important is that the symbolic processor can identify it as a symbol. Of course, and as shown, an expression is not a symbol. The symbolic solver cannot solve for expressions. Fotunately the substitute command can be used to substitute a symbol for an expression ...

 

Success!
Luc

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