# Questions tagged [code-generation]

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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 ...
• 52.4k
84 views

### Activating part without resolving [[1]]

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, ...
• 2,688
60 views

### Have Button fire with both Kernel and FrontEnd

Here's some code which, when evaluated, types an expression in the cell below it: ...
• 2,688
1 vote
164 views

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

I've used the following code to simulate defining operations between functions: ...
• 403
63 views

### 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 (...
• 4,391
99 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 ...
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54 views

### 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 ...
• 2,863
339 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 ...
• 493
104 views

### 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 ...
• 323
63 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 ...
• 2,863
1 vote
61 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 ...
• 609
212 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 ...
• 421
1 vote
47 views

### General question about RSolveValue and general programming

If I have the following code: ...
• 421
1 vote
101 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. ...
• 83
274 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 ...
• 2,863
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 ...
• 4,391
123 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 ...
• 2,410
177 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 ...
• 757
82 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 (...
• 277
193 views

### 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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470 views

### 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 ...
• 1,409
113 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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513 views

### 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 $m$.
• 1,723
79 views

### How generalizes (automate) recursive code

This is a small version of my code (for n=2): ...
• 558
741 views

### 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., ...
• 655
1 vote
119 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 ...
• 195
1 vote
55 views

### SymbolicC namespace?

What is the equivalent for C++'s using namespace ...; in SymbolicC package of mathematica and are there any good resources like ...
• 8,217
181 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 (...
98 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 ...
111 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: ...
105 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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766 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 ...
• 1,249
217 views

### 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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52 views

### 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'
• 5,589
84 views

### 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 ...
• 111
573 views

### 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: ...
• 767
491 views

### 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... ...
• 8,308
1 vote
399 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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629 views

### 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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133 views

### Applying And to a list inside a Function

And has HoldAll attribute and test its argument by sequence. But doing And@@{} will lost ...
• 7,661
117 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 ...
• 5,589
189 views

### 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 ...
• 5,589
1k 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 ...
• 225k
343 views

### Automatically add debug contents to a program

Sometimes I'll use Print[1] or Print[n] to debug in a long loop, but it's really a boring job to add these sentence by sentence ...
• 9,188
346 views

### Generate assignment code to symbols from string

I want the function to take in string, then assign a value to its corresponding symbol. An implementation using ToExpression is ...
• 7,661
128 views

### Uniting lists of lists

Here's what I'm trying to do. First a simple example: ...