All Questions

I am working with a particularly long function that, when I want to evaluate it at a certain $x$, shows: As you can see there are expressions herein of the form Sin[2. x] or Cos[2. x]. What do these ...

For example, I have the following integral expression: g[x, y] = Integrate[f[x, y],x] How can I modify the above expression to achieve the following definite ...

I have the following expression: Exp[r*t*x + e*r*y + t*x*r^2 + y^2*e*Sqrt[r]] I want to choose some arbitrary terms in the power and for example write the ...

From an examplary plot plot = ParametricPlot[{1 Cos[s] , 2 Sin[s]}, {s, 0, 2 Pi}] I know how to get the plotted points ...

I would like to analytically integrate a function in Mathematica. However, I have found a problem with the final result when I compare it with the numerically integration of the same function. Here it ...

I was wondering if there is any way to put time constraint on FindInstance. My problem is as follows: I want to find two, $2 \times 2$ matricies $A,B$ given $Tr(A)$, $Tr(B)$, $TR(AB)$, $Det(A)$ and $...

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I have written a very simple nested If as follows ...

I'm sure there is an easy solution to this, but I can't remember how to set something like this up. I was thinking a differential equation may be the answer. For context, this relates to stocks, but ...

I was trying to evaluate a NDSolveValue function of mathematica, but it is taking excessively long time (~30 min) now. I am not sure if I shall leave it alone or quit the kernel. Is there a general ...

my friends,i meet some problems,please help me! this is my equation and ic ,bc this is my code .I let some constants R,in,D,F become 1，h become 2，it is convenient to calculate ...

A bit complex than a similar question, below is a minimal example, eqs1 = a b x'[t]^2 - ac x''[t] eqs2 = x''[t] - b x'[t] - c == 0 I want take ...

Bug introduced in 12.0 or earlier and persisting in 12.3.1 I've generated a Mathematica plot. When I right-click it and save it in a SVG file format like PDF or EPS, it looks great. (Unfortunately, I ...

I have the following expression: Sum[x^n, {n, 1, Infinity}]*Sum[Log[m, x], {m, 2, Infinity}] How can I Force Mathematica to write this expression in the following ...

I have the following expression: Exp[a * x + b * y + c * z] I want to write this expression as: ...

I am writing a very long code and I need to refer to some line of codes in comments to clarify the definitions. Is there any way that I can refer to a line in a Notebook or create a hyperlink to take ...

I have the following expression: Derivative[0, 1][Integrate[E^(-(n*\[Tau]) - I*k*y*Cosh[\[Tau]])*B[\[Tau]], \[Tau]]][x, y] which is created by substitution of a ...

I am trying to solve this first order ode In[1]:= DSolve[{(1 - x) f'[x] - f[x] == 0, f[2] == 1}, f, x] Out[1]= {{f -> Function[{x}, 1/(-1 + x)]}} as a series ...

I have an equation in the following form: Integrate[A[x], x] + Integrate[B[x], x] == Integrate[C[x],x] How can I simplify this equation to get: ...

I have a very long code that may have errors in definition of functions and I want to trace these errors. Is there any attribute or function to detect whether a function is initially defined in the ...

I am wondering how to extract entities such as states and cities from TravelDistanceData. For example, given the following example from the documentation, how could I extract the states the route goes ...

Very poor knowledge of coding and Numerical solutions. please any body help me. I want to solve the following equations (a'[t])^2=(-κ/3)*(-(φ'[t])^2+V(φ)) a''[t]/a[t]=(-2κ/3)(1+3ω)((-Φ'[t])^2+V(φ)) φ''...

I'd like to reproduce Panel A of Figure 7 (red curve) of this paper, which represents the steady-state solutions of four coupled ODE's, and verify this claim that the diagonal branch in the Z-shape ...

I have the following function: ee[x, y] = Integrate[x^2 + y^2, x] I want to calculate the derivatives of this function w.r.t x ...

I need to use Compile[] for a very large expression to be integrated. But for Compile[] the expression has to be evaluated, and this takes endless time. The expression is composed of several functions ...

For an arbitrary self-intersection parametric curve, how to construct the region at its first instersection. Thanks! ...

I want to create a piece of art similar to the following two images of Grace Hopper and Bill Gates: I know how to create a word cloud and want to extend this knowledge to make something similar to ...

I am trying to do the following: c[n_, x_, y_] := ToExpression["p" <> ToString[n]] = {x, y} That is: Evaluating ...

Here is the code which calculates the Pearson correlation coefficient affect by the Ramp[] function, where c is the general form ...

Kernel executables seem to be relatively small wrappers around "dynamic link library" that contains all the functionality of the kernel. Is it possible to load the kernel (as a dynamic link ...

I'm trying to create a code that estimates the number of real roots of a polynomial. General algorithm is outlined in this document: http://stellar.mit.edu/S/course/6/sp10/6.256/courseMaterial/topics/...

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I have used this site to learn about how to store entities with many data points such as Cities, AdministrativeDivisions, and Aircraft. I am wondering what are some good guidelines to accelerate the ...

I am wondering how to create a global function. I want to build a function that will persist even when Mathematica's kernel is aborted and closed and eventually restarted. I think the answer has ...

How can I hide or disable the automatic legend feature of GeoListPlot? I have the following code and results: ...

I am trying to plot the solution to the Dolve at a position /. x -> 0 ...

I want to check that an identity about matrix is true for all dim n. My idea is to view dim n as a parameter and then Simplify the expression. For example,I hope <...

I am learning how to use GeoListPlot and am trying to figure out if there is a way to make different entities in a single list different colors. An example of my code so far is: ...

I have a recurring problem where I try to start up Mathematica and it freezes. For every time I try to open Mathematica, it only works about 20% of the time. I have an HP Envy x360 laptop with 32 GB ...

How can I find all functions with a certain number of arguments? For example, how can I find all the functions who do not require an argument like RandomReal[]?

I am using a piecewise function to define the height of columns. My goal is to make a nice picture that illustrates the different heights of the columns using color. Below in the picture I have ...

I have two expressions as follows: r (Sin[t]+Cos[t]) and the rules for simplification are: {x == b + x Cos[t], y == r Sin[t]} ...

I want to find the FWHM of a conductance peak I created on mathematica (see Figure). until now I used the FindMaximum to calculate the max of the peak. ...

Is it possible in Mathematica to replace the part of the name of the function to give the same arguments to another function? In fact, I have a lot of functions with the following name pattern: ...

Manipulate[Column[{ Plot[Sin[a x], {x, 0, Pi}], Plot[Cos[a y], {y, 0, 2*Pi}], Plot[Tan[a z], {z, 0, 3*Pi}]}], {a, 1, 10}] I want to put a popup menu here as Sin, ...

I have, until recently, had great success using discrete variables to manage local changes in the definitions of the derivatives with NDSolve. Now, for reasons I don't entirely understand, this ...

How can I list functions related to a specific function in a notebook without opening the documentation center? Sometimes I think I have the right function and have trouble remembering similar ...

I would like to find a way to get the name of every single ResourceFunction published on the Wolfram Function Repository. How can I find the names of every single function?

I am facing a problem that my FindRoot doesn't find the actual roots. I am trying to make a loop that iterates my parameter sets (U0,X0,\Sigma0) to find sets that satisfy some conditions. Here is my ...

I have a little problem. I need to calculate an line integral of a function on a rectangular oriented closed path. For example I define f[x_,y_]:= x-2y and the ...