# Questions tagged [built-in-symbols]

Questions related to handling built-in symbols and functions, for example why they behave a certain (possibly unexpected) way.

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### Factor gives non-factorized result

The Factor built-in function is usually idempotent, namely applying it twice gives the same result. However, in the following example it is not. Is that expected? ...
41 views

### Palette that gets single keystroke as input

I could find many examples of user-made Palette with many buttons in it. And drawing-tools Palette is not user-made, but it accepts a single keystroke as input. (In ...
1 vote
35 views

146 views

### What is the purpose of StrokeForm?

Symbol SystemStrokeForm is present already in Mathematica version 8 (but not in version 5.2). Currently, it is used in built-in themes, for example: ...
57 views

### Using the symbol of the system of equations [duplicate]

Part 1 I'd like to know how to use the symbol of system of equations (left curly braces). I tried the following code: Part 2 How can I add a third equation?
1 vote
531 views

### Symbol of system of equations

I'm wondering if there is a way to use the symbol (the left curly bracket) of a system of equations. So far I found only the following "symbol": I need to remove the two conditions. EDIT2: ...
81 views

### Is there a comprehensive list of most common or most important native Message-s (w/tags) for errors and Failed?

Yes I understand how to use Messages[symbol] but that doesn't help much. I have no idea which important ones I may have missed in my search or even how many exist. ...
1 vote
64 views

### How can I clear the symbol \[ImaginaryJ] for use for another purpose?

By default it is the same as imaginary unit, but I want to use it for split-complex numbers.
1 vote
184 views

### Separate colours of an image

Since LAB colour space is based on opponent color theory, an image in 'LABColor' is made up of red/green, yellow blue separations. I am trying to separate an image into its distinct colour components (...
124 views

### NMaximize - global maximum fail - How to?

Problem : Let x,y,z be non-negative real number whose sum is 1. Find maximum of 0.2x + 0.2y + x^2*z + y*z^2 What I did first was reducing variable. ...
331 views

### Largest k such that p^k divides n

(Here all variables are integer.) Is there a built-in function f[n,p] such that f[n,p] = largest k such that p^k divides n For ...
105 views

### Can I tell whether a symbol is build-in (part of the System library)?

I'd like a function that checks whether a symbol is a predefined part of the language or not. More generally, it might check whether it's part of a given package. ...
148 views

### Built-in functions on the LHS won't pattern-match

I have this pattern-matching problem: F[X_,myminus[X_]]:=0 F[1,myminus] Works. ...
415 views

### AnyTrue is too good (compared to MemberQ)

Let L be a list of integers, and ⓝ denote an explicit integer. I've thought the most natural way to tell whether ⓝ belongs to L is In MemberQ[L, ⓝ] But there ...
58 views

### Definition of large expression - makes PC freezed

In A=Range[10^4];?A Out (* definition of A*) It works for 10^4. But if I increase the number to 10^6 ...
80 views

### Construct really identical function (the same as Length)

In Length[Unevaluated[1 + 1 + 1 + 1]] Out 4 Q1) Can we construct a function named f, such that ...
97 views

### Check an input matrix M contains any nonzero diagonal matrix element or not

Is there a way to easily check an input matrix M contains any nonzero diagonal matrix element or not? For example, if the M contains any nonzero diagonal matrix element, Output: True. if the M ...
226 views

### Get list of special characters

I recently found that \[Gradient] and \[InlinePart] both expand (contract) to special symbols in MMA. So far as I can tell (see ...
1 vote