# All Questions

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### How to do a region plot with many functions [duplicate]

Hello i am trying to compare many function, i want to see witch one as the lowest value depending on 2 variables. My solution so far is something like this: I have 7 function: P1 P2 P3 P4 P5 P6 P7, ...
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### Applying chain rule to evaluate a derivative when the component function is not differentiable at one point [migrated]

I got the following question. Can anyone help me? Thanks! Y is a smooth function of X. and X is a function of r, which kinks at r=r0, but is smooth everywhere else. I was try to compute dY/dX at ...
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### Extract the minimum positive root from a quintic [closed]

I need to compute the values of ϵϵ and x2 from the following sytem: ...
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### plot $f(x)$ against $\frac{1}{x}$ [closed]

Hi guys this is really a simple question: if i have $f(x)$ how do i plot this function in mathematica against, for example, $\frac{1}{x}$? thanks in advance
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### UnFlatten an array into a ragged matrix

Trying to unflatten an array that was part of ragged array of sub matrices. As input we have flattened array: ...
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### Recursive function with array of variables

I am trying to create a recursive function which works with an increasing array of variables. Since the formula is quite complex, i will try to simplify my example to the core of my problem. The ...
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### Conditions for proper integrals with DSolve on Mathematica

DSolve[{RCS'[s] == SNPH[s] - Sqrt[R2[s] - RCS[s]^2]/b,SNPH'[s] == RCS[s]/a^2, R2'[s] == 2 RCS[s] SNPH[s], RCS[0] == 0., SNPH[0] == snal, R2[0] == ri2}, {RCS, SNPH, R2}, s ]; Here {a,b,snal,r12} are ...
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### Ordering the Boundary points of a Polygon

I feel like this should be simple, but I keep running into walls. Say someone gives you the coordinates of the vertices of a pentagon and the center point of the hexagon. Is there any way to get an ...
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### Interpolation of 4D data

To create a table and an interpolation function of 3D data T=f(X,Y) I have the answer here: interpolation of 3D data How to create a table/interpolation function of 4D data T=f(X,Y,R)? If I do ...
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### Problems running Mathematica 10 with Workbench 2 Windows 7 64 bit

My Workbench runs perfectly using Mathematica 9, however simple things which run just using the Mathematica 10 front end won't run when using Mathematica 10 and Workbench 2. These simple two lines of ...
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### Listlineplot starting from 0 [closed]

I got a matrix which looks the following and should be seen as a list of pairs with (x,y) coordinates: test = {{0, 1, 2, 3}, {11000, 23940., 36880., 49820.}}; ...
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### NDSolveValue producing message: Input is not an ordinary differential equation

I have an urgent question for my program because I get always an error output for it. I have a partial differential equation that I want to solve with NDSolveValue. ...
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Let ...
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### How to do DateDifference on table items containing dates

I have a Table with data in form {{date}, value}: ...
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### How to create a 'shortest-path link matrix'?

I am currently struggling with a problem in Mathematica. I have a randomly generated weighted Barabasi-Albert graph and a corresponding demand matrix of the same size. I'm generating the graph with ...
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### Wrong values at the boundary of differential equation solution

I have a second order ordinary differential equation and want to solve it numerically. Although I have specified values at the boundary, Mathematica solution does not match with boundary conditions. ...
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### Why does Mathematica have trouble with this simple set of simultaneous equations? [closed]

The code in question is: Solve[{x == r*Cos[\[Theta]], y == r*Sin[\[Theta]]}, {r, \[Theta]}]. I'm a newbie so this might be fairly basic, but shouldn't this work? ...
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### if f(x) is O(g(n)), then does it follows that h(f(x)) is in O(h(g(x))? [closed]

if f(x) is O(g(n)), then does it follows that h(f(x)) is in O(h(g(x))? Can we prove or disprove it? In my class, we proved that nlogn is in O(log(n!)) But n^n is not in O(n!) It just feels weird.
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### Can I check if an expression is positive using assumptions?

I have the following notebook: ...
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### How to make Epilog render behind the main plot [duplicate]

Consider this example: ...
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### Dual core CPU — Mathematica uses only 29% of one core [closed]

I hope that this question hasn't been answered, yet. At least I couldn't find any answers to that for quite some time now. I am using Mathematica 9 on windows 8. I have two cores. My calculations ...