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Nov
17
reviewed Approve suggested edit on Limit of a complex function
Nov
17
answered Seek a quick way to bring standard order back to original after Complement
Nov
17
reviewed Approve suggested edit on Impact Crater Simulation
Nov
17
answered Limit of a complex function
Nov
17
answered Why the result by hand is different from the command “DSolve”?
Nov
17
comment Why the result by hand is different from the command “DSolve”?
If you simplify M answer, then it becomes: Simplify[%]; y[x] -> 1/50 E^-x (50 C[2] Cos[2 x] + E^x (-1 + 5 x) Sin[x] +Cos[x] (E^x (-7 + 10 x) + 100 C[1] Sin[x]))
Nov
17
comment Long run time for older code that ran fast in older versions
@cormullion I have all Trott books. I do not actually run any code, I just use them to read the code from the pages and try to figure what it does, but it is too advanced for me. 90% of the time I can't understand the code, but I like to look at it still because it looks amazing.
Nov
17
comment Why is `NMinimize` trying to evaluate my function analytically instead of numerically?
Just a wild guess, try adding ?_NumericQ to the argument of the function called. see support.wolfram.com/kb/3820
Nov
16
comment Passing lists to functions in a manner that works like pass-by-reference in other languages?
I just saw your edit. I do not know if this was after I answered or before. But I assume now it is all clear? Or is there still a problem?
Nov
16
revised Passing lists to functions in a manner that works like pass-by-reference in other languages?
added 322 characters in body
Nov
16
answered Passing lists to functions in a manner that works like pass-by-reference in other languages?
Nov
16
comment Passing lists to functions in a manner that works like pass-by-reference in other languages?
Mathematica passes things by value, not by reference, like in say Fortran. Yes, you can force by reference in M, but this requires extra setting. I'll post an answer if that what you want, but it is best to assign the result to s
Nov
16
comment Passing lists to functions in a manner that works like pass-by-reference in other languages?
remove the ; at the end of your function, and assign the result to s, like this: !Mathematica graphics
Nov
16
comment How can I find the derivative of a combinatorial expression?
derivative with respect to what?
Nov
16
comment Solving a nonlinear system of recurrence equations
You are missing an n argument. There are examples in help reference.wolfram.com/mathematica/ref/RSolve.html
Nov
16
revised Exporting a Table of Graphics into Individual Files
added 278 characters in body
Nov
16
answered Exporting a Table of Graphics into Individual Files
Nov
16
answered Getting an equation of particular curve
Nov
16
answered ListPlot multiple datasets over same x-values
Nov
16
comment Constrain integration to be over real domain
First, it is better to use lowerCase letters. In particular D is used by Mathematica for derivative. so this is better: Integrate[(2*Cos[Sqrt[f]*z - g])/E^(d*(p + z)^2), {z, -(h/2), h/2}]], also, just because I shows up in the solution, does not mean the solution is complex, since I can cancel out. Is this solution Exp[I x] + Exp[-I x] complex?, and finally, if you can't find the right assumptions to limit solutions in the Reals, what is wrong with simply filter these out after obtaining the solution? but again, you want to make sure the solution is actually complex when simplified.