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Mathematica : Recent Questions and Answers (Page 190)

Find answers to your questions about Mathematica or help others by answering their Mathematica questions.

Animating the solution to the Insulated 2D Heat equation with inital condition in a rectangular region

I am very new to mathematica and I tried to give my best shot at animating the 2d heat equation with a given initial condition:heqn = D[u[x, y,...

Asked on 01/16/2021 by Mayur Matada

1 answer

Simultaneously fitting multiple datasets

What is the proposed approach if one wants to simultaneously fit multiple functions to multiple datasets with shared parameters? As an example consider the following case: We have to...

Asked on 01/16/2021

5 answer

Missing integration constants in solution to PDE

I am attempting to obtain the analytical solution (if possible) to the following: $$a w^{(1,0)}(x,t)+b w^{(0,1)}(x,t)=p(x)+g w(x,t)$$$$I.C.: w(x,0)=0 | B.C.: w(0,t)=z(t)$$Clear["Global`*"]a = v;b = 1;g...

Asked on 01/16/2021 by Scott G

1 answer

Strange Show Behavior

When attempting to overlay a Discrete Plot on a Histogram, no matter the order I pass each argument in Show, the Histogram stacks over the Discrete Plot. Is it possible...

Asked on 01/16/2021 by BOUNCE

2 answer

How does BoxWhiskerChart detect outliers?

BoxWhiskerChart can detect and show outliers:SeedRandom[39]BoxWhiskerChart[ RandomVariate[NormalDistribution[], 100], "Outliers"]What is the precise mathematical criterion used to decide if a point...

Asked on 01/15/2021 by Szabolcs

2 answer

How to duplicate UpValue of one function to another?

Let's say I have defined a function zO for the following up-valueszO/:zO[x_]+zO[y_]:=zO[x+y];zO/:zO[x_]+zo[y_]:=zO[x+y];zO/:zO[x_]-zO[y_]:=zO[x+y];Now I want to define another function zOE which have the same up-values. How can I do this...

Asked on 01/15/2021

1 answer

average distance between features on image

I have this image: and I would like to measure the average distance between the red dots.It is important...

Asked on 01/15/2021

0 answer

Replace elements of a list based on a function

I have a function of k (written in the form of a table/list to get values) for 16 integer values from 1 to 16:f = Table[3*k*k, {k, 1, 256}]I...

Asked on 01/15/2021 by tabi_k

5 answer

ListContourPlot table problems

I have a table of the form xrange={0.1,1,0.05}yrange={3000,15000,100}tab1=Table[{x,y,z[x][y]},{x,xrange},{y,yrange}]where z[x][y] comes from previous calculation and is a set of numerical values. I would like to do a contour plot, but...

Asked on 01/14/2021 by Carrie

1 answer

How to use Solve[] properly to find an integer 3d vector solution to an equation with a condition?

I didn't use Mathematica for years and I am VERY rusty regarding the best way to solve this problem : 2*vectk.vectG = G^2, k = 2*pi/lambda I have the G...

Asked on 01/14/2021

0 answer

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