What about complex mathematical operations such as sin, log and tan in Java?
Program description DD 2021-06-25 02:34:50

Do you remember all kinds of complicated mathematical formulas in the school days ？sin、log2、tan And so on. , If I see this, I think it's troublesome ？

adopt MXReflection frame , You can use Java Computing these mathematical operations and functions that we once thought were extremely complex , Just use the fields related to the class .

MXReflection You can read the value from the specified field , And inject the results into the @Expression Comment fields .

So how to use this framework ?

It's simple , Only two... Are needed java notes .

1、 adopt @Arg value , We can specify the name of the custom parameter to be used in the objective function .

2、@Expression Comment values contain function expressions with arguments .

It's not hard to use this framework , Here are two calculation cases , It's easy to understand how to use this framework through cases ：

Output:

## Case study 2

Output:

MXReflection Framework support mXparser The math set provided in the math library is as follows ：

• Operators (+, -, *, /, #, !, ^)
• Binary Relations (=, ==, =<, =>, <, >, <>, !=, ~=)
• Boolean Operators (&, &&, /, ~&, ~&&, ~/, |, ||…)
• Bitwise Operators (@~, @&, @^, @|, @<<, @>>)
• Unary Functions (sin, cos, tan, tg, ctan, ctg, cot, sec,…)
• Binary Functions (log, mod, C, Bern, Stirl1, Stirl2, …)
• 3-args Functions (if, chi, CHi, Chi, cHi, pUni, cUni, qUni, pNor, cNor, qNor)
• Variadic Functions (iff, min, max, ConFrac, ConPol, gcd, …)
• Iterated Operators (sum, prod, avg, vari, stdi, mini, maxi)
• Calculus Operators (int, der, der-, der+, dern, diff, difb)
• Math Constants (pi, e, [gam], [phi], [PN], [B*], [F’d], [F’a], …)
• Physical Constants ([c], [G.], [g], [hP], [h-], [lP], [mP], [tP])
• Astronomical Constants ([ly], [au], [pc], [kpc], [Earth-R-eq], …)
• Random Variables ([Uni], [Int], [Int1], [Int2], [Int3], [Int4], …)
• Metric prefixes ([%], [%%], [Y], [sept], [Z], [sext], [E], …)
• Parser Symbols ((, ), ,, ;)
• Units

In parameter analysis ,MXReflection Supports all field data types with digital content as parameters . You can put all of Java The type is the same as... That returns the numerical result toString Implementation used together . Supported result fields java Type a ：

• Double
• double
• Long
• long
• String
• BigInteger

But pay attention to , about long、long and BigInteger,MXReflection Use to parse the final result before injection . It is recommended to make sure that the expression returns an integer type .

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