# Questions tagged [code-generation]

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### Stepped Infinite Square Well [closed]

Here is the link for making the above graph for the Stepped infinite square well. The problem here is, all the eigenfunctions and energy eigenvalues are previously defined. Whereas, I want to use this ...
• 1,086
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### How to convert any string of code to an input cell?

This is a generalization of this question, which already has very nice answers. Suppose str is a string of valid code, so that ...
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260 views

### How to generate input cells whose code is determined dynamically?

Following this post, I want to use code to generate an input cell with new code. However, unlike the linked post, I want my code to dynamically determine the new code to be printed in the input cell. ...
• 803
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### Convert boundary condition involving derivative to NeumannValue programmatically

As discussed in e.g. what causes the error "The dependent variable in the boundary condition needs to be linear" when using NDSolve? When FiniteElement ...
• 58.6k
88 views

### Activating part without resolving []

I'll try to make this question more clear in a little while. In the mean time, I'll ask directly the question which motivated it: Latin Square from submatrix Original Question I want, for instance, ...
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70 views

### Have Button fire with both Kernel and FrontEnd

Here's some code which, when evaluated, types an expression in the cell below it: ...
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1 vote
165 views

### How to use Through by default on numeric functions?

I've used the following code to simulate defining operations between functions: ...
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### How to formulate NDSolve[...] for a two-sector SIR model

The following Code aims to simulate the employment effects of a pandemic, drawing on the conventional SIR model. I extended the SIR model with two economic sectors (...
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102 views

### Is it possible to automate definitions given with TagSetDelayed?

I am using the following two lines of code relatively frequently f/:Plus[f[x_], f[y_], z___]:=f[x+y]+z f/:Times[c_, f[x_]]:=f[c x] and I was wondering if it is ...
• 152
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### Compiling RiccatiSolve LQRegulator gains

Given some specific matricies, numA, numB, numP, q and r to calculate LQR gains, one can use simply LQRegulatorGains or solve the same via ...
• 2,913
376 views

### How to programmatically modify a function definition

I would like to know an efficient method (without converting Mathematica Code to strings and string processing) of modifying a function definition programmatically. For example, I would like to tidy ...
• 503
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### Turn definitions into rules

I know that this seems to be unnecessary, but here I have a bunch of assignments, like around 50, and I want to create rules for all these to have the freedom to apply these rules only on certain ...
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64 views

### Microcontrollerkit No longer compiles code after update

I recently restarted a project where I used MicrocontrollerKit to generate code for me into the Wiring language to be then imported into arduino IDE for editing and ...
• 2,913
1 vote
63 views

### Optimal code generation for evaluation of a fixed set of multivariate rational polynomials

Given a set of multivariate rational polynomials, is it possible to find the optimal (shortest or least expensive in some other sense) sequence of arithmetical operations, such that it results in ...
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238 views

### Assign a variable to a condition only if the condition is met using Which

If I have a conditional of the form: Which[Round[b[i], 0.1] == 74,1,40 < b[i] < x,2] where b[i] represents a number that ...
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1 vote
49 views

### General question about RSolveValue and general programming

If I have the following code: ...
• 421
1 vote
107 views

### How to solve first order complex differential equation?

I want to solve these differential equations and want to get the value of 'a1'. I used this code given below but it is not showing any result. If anyone can resolve this will be appreciated. ...
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279 views

### Understanding code generated by MicrocontrollerEmbedCode

I've been using MicrocontrollerKit for a while now to generate code for little projects, inverse pendulums, filters, etc. Generally it works well. I am now currently trying to design a LQI (Linear ...
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66 views

### How can I index a function with the type of dataset used

I have the following code which serves my purpose for a single matrix input. For one or two matrices, the operation can be done manually, but I have 65 matrices and ...
• 4,803
140 views

### MWE for compiling functions into standalone DLL and calling them in Python?

I have read calling-a-compiledfunction-dll-from-outside-mathematica and the CodeGeneration tutorial and scanned other related questions too numerous to mention, but I am still unclear about how to ...
• 2,470
200 views

### Converting Piecewise function to C code

I'm trying to convert a function to C Code f = D[Piecewise[{{x^2, -10 < x < 0}, {x, x > 0}}], x] I decided to scan through conditions and corresponding ...
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88 views

### Compiled library crashes at WolframLibraryData_new

I am using CreateLibrary to create a dynamic library of a Mathematica function, so that it can be linked into standalone code, but I run into segmentation faults (...
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### Easy code help about matrix. How to change the elements in a given matrix?

For example I have a matrix A[1,1]={1,2,3,4}; Now I want to change the second element of A[1,1] to ...
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### How to get a peek at the source code for demonstrations if there is no source code provided [closed]

NOTE: The prequel to my question has been answered before here In the case of the question linked above, the author's code was available. But I would like to know if it is possible to reveal the code ...
• 1,419
116 views

### Solving a difficult differential equation

I've the following DE, describing a physical phenomenon. And the prupose is to solve that DE using Mathematica x(t)\cdot r+x'(t)\cdot l+a\cdot\ln\left(1+\frac{x(t)}{b}\right)=0\space\...
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### NDSolveValue solutions differ based on number of equations

Short version: Do the methods (or other things the function uses to solve the equations like time steps or error estimates) that NDSolveValue uses by default depend on the types and quantity of ...
• 838
1k views

### Making a table of solutions from NSolve or Solve

How can I generate a table of solutions to an equation such as this: Solve[{a^m+b==c,b-m==a+Sqrt[n]},{a,b}] for some given values for $n$ and $m$.
• 1,901
81 views

### How generalizes (automate) recursive code

This is a small version of my code (for n=2): ...
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### How can I automatically generate usage messages?

When programming, I try and name my functions and arguments clearly and document them with usage:: so I can keep track of everything; e.g., ...
• 667
1 vote
122 views

### Optimizing an expression – find identical subexpressions and substitute them

I'd like to simplify a complex symbolic expression expr by substituting and listing subexpressions that appear more than once in ...
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1 vote
56 views

### SymbolicC namespace?

What is the equivalent for C++'s using namespace ...; in SymbolicC package of mathematica and are there any good resources like ...
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187 views

### Should I implement an iteration with a While-loop? [closed]

I have written a code that uses a guessed eigenvector (avecs) to construct a Hamiltonian (my hamiltonian depends on its own eigenvectors, so I can not solve it directly and I need to use iteration (...
100 views

### How to create a file that runs without displaying the code (similar to an .exe)

I am writting a code that could be useful for some people. The program will be free but I would like to protect the code. As I am not good at explaining myself I will simply illustrate my question ...
113 views

### Help with NDSolve for system of odes [closed]

Can someone please tell me what I am doing wrong? I am trying to solve a system of odes using NDSolve. The code I have written is as follows: ...
106 views

### Division sieve operations in Mathematica

I am just wondering how to easily compute this problem using Mathematica. What Percent of Even Integers are Divisible by either 6, 20, 28 or 70? My purpose is to extend this to a finite number of ...
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804 views

### Write Power in CForm[] as multiplication instead

Is there a simple way to make Mathematica write CForm[p^2] not as Power[p,2] but rather as ...
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### Bug: Library functions from older versions of Mathematica may crash in Mathematica 11.1 and conversely

The following is a confirmed bug [CASE:3846875] that turned up in the prerelease 11.1.0 and is not solved in the official release. This is a small example. Execute the following commands in ...
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### SymbolicC: Is there a CChar, i.e. a way to generate a single character constant?

I am aware of CConstant and CString, but neither can output the single-char literal 'a'
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### Applying a function for several sets of input [duplicate]

I'm trying to understand the Wolfram language and copied some examples from the documentation into a workbook and then tried to work through examples of my own. I'm attempting to evaluate a function ...
1 vote
122 views

### What Does Slot Mean In Root Output and How To Translate It To Code? [duplicate]

I have the notebook below which produces the correct numerical output but the CForm function doesn't appear as though it is working correctly (or I don't know how ...
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### Metaprogramming: creating compiled functions from inter-dependent code blocks

I want to create a compiled function from inter-dependent code blocks. Here is a minimal example showing the salient features based on strings: ...
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### Christmas fun with Mathematica [closed]

In a previous post we saw how we can create animated snowfall. So, I was wandering what else, related to Christmas, we can do with Mathematica? Perhaps, drawing a tree full of ornaments and lights... ...
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1 vote
411 views

### Writing text inside Venn Diagrams

I found this question which is extremely cool and amazing How to plot Venn diagrams with Mathematica? which also helped me in plotting and creating Venn Diagrams. But there is something that is ...
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### OptimizeExpression to C code

Is there a function which turns optimized expression to C code? Calling ExperimentalOptimizeExpression[ Sin[x] + Cos[Sin[x]]] returns ...
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134 views

### Applying And to a list inside a Function

And has HoldAll attribute and test its argument by sequence. But doing And@@{} will lost ...
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118 views

### SymbolicC`CSwitch basically broken?

The CSwitch manual page gives the example CSwitch["val", 1, CAssign["i", 10], CBreak[], 2, CAssign["i", 3], CBreak[]] // ToCCodeString which generates this ...
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### SymbolicC/SymbolicCUDAFunction generating C/C++ parser?

I wish to do some program transformation and analysis. Is there any package that generates SymbolicC expressions from C code? In a sense I'm looking for the ...
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2k views

### Compute Hessian of function symbolically

This question could equally apply to the computation of other symbolic transformations of a function, but I use the Hessian as an example here. Consider a two-variable function ...
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362 views

### Automatically add debug contents to a program

Sometimes I'll use Print or Print[n] to debug in a long loop, but it's really a boring job to add these sentence by sentence ...
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