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# Using libraries in Fortran

## Using libraries in Fortran

(OP)
Hello everyone.

I'm wondering, how to use libraries in programming. For example, I need to make program that finds minimum and maximum of a function of two variables... As I understood, I can use routines i find online, but need to have something saved on PC? Some module file?

One more question, as I started first with finding ways to find a derivative of a funtion, I'm wondering how can I enter my f(x) into program? For example the program starts, it asks me to type in the f(x)=x^2+2xy+y^3 ...I don't understand how is that interpreted by program, does it parse the f(x) somehow; turns it in some array? How it reads this expression and turn it to arguments needed for derivation?

Please if someone can answer my questions...I have problems with concept understanding, cause I'm new in this and need to explore some things for project I'm doing on the university...

### RE: Using libraries in Fortran

In general, your FORTRAN compiler will have math libraries available for an extra cost that do many math functions. If you are learning FORTRAN at school, I would guess they want to get you to understand the language and how to construct a program that solves a given problem like the derivative you gave. Look up Newton–Raphson method and see if that is what you are trying to do. It is a numerical method that can be programmed to guess at a solution and refine the guess until you converge on a solution.

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