Questions tagged [variable-definitions]
Questions on assigning and unassigning definitions to names that represent them, including issues raised by context and localization. Use tag [assignment] for issues relating to Set versus SetDelayed.
522 questions
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4
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255
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`With` with auto-generated local variables
The strange goal
I want to do something like this
...
- 4,293
2
votes
2
answers
116
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How to save values for numbered/indexed variables using DumpSave
I want to programmatically create a set of variables (each corresponds to an index n, for example: {a1,b1} or ...
- 589
4
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0
answers
198
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Why is Mathematica thinking that 1 is a variable?
I'm trying to solve an ODE and upon executing:
...
- 197
2
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2
answers
257
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Package level variable and local module variable with same name. How to distinguish between them?
In Maple, there is clear distinction between same named variable, one which has module scope and one that is local inside a function.
I am not able to reproduce this in Mathematica package. In this ...
- 156k
2
votes
2
answers
116
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Table with a constrained double pair of {a,b} variables
How do I use Mathematica to write the constrained double pair of {a,b} variable ranges from and ONLY from the list {{0, 0}, {1, 1}, {0, 2}, {1, 0}, {0, 1}, {1, 2}}?
I tried this toy model example, but ...
- 963
0
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1
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147
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heat equation-second order partial differential equations
I am dealing with the following set of pde
$\alpha(p,q)+2p\frac{\partial\alpha(p,q)}{\partial p}=0$,
$\frac{3}{2}\alpha(p,q)+p\frac{\partial\beta(p,q)}{\partial q}=0$,
$A\frac{\partial\alpha(p,q)}{\...
- 31
3
votes
1
answer
203
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Can't plot this piecewise function [duplicate]
I have a function, int1[w] which incorporates two yet-to-be evaluated constants, u a positive real and ...
- 2,409
3
votes
3
answers
505
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How to Precompute and Simplify Function Definitions?
I'm defining a function in Mathematica as follows:
f[x_] := x+x-x //FullSimplify;
In this setup, every time f is called, FullSimplify is executed, which can be ...
- 75
2
votes
1
answer
121
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We would like to define $k$ in advance as an even number
Can we define in advance that $k$ is even?
For example, when defining the sequence $\{a_n\}$ inductively as follows,
input:
...
- 291
4
votes
1
answer
151
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Variable localisation in Table
I'm trying to understand Mathematica's behavior when creating a Table based on a given list of variables. I'm using a dummy variable to iterate through the list, and I want to make sure that ...
- 297
5
votes
2
answers
400
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Local indexed variables in With
I need to use local indexed variables inside With but it is not allowed, the same for Block and ...
- 32.8k
1
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1
answer
65
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Optimizing the assignment of variables to DateIntervals for large sets
I have a dataset of 17 time intervals with the form:
dataset1 = {{{1969, 7}, {1970, 2}}, {{1972, 4}, {1973, 4}},...}
The goal is to plot them with "...
- 55
1
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0
answers
87
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Hermiticity of a matrix that depends on a symbol
Suppose I have a real number $x$, and I want to check the hermicity of the matrix $A=x\sigma_x$, here $\sigma_x$ is the Pauli matrix $\{\{0,1\},\{1,0\}\}$, I run the code
...
- 11
2
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0
answers
135
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Why do notebooks by default put symbols in Global context where they can collide with all other notebooks?
This default setting can cause subtle and difficult to find problems, such as inconsistent or incorrect answers when symbols, variables or functions in different notebooks have the same name. I speak ...
- 61
0
votes
1
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80
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Defining Objects using a Table or Loop
Suppose I want to define weight[] on a list. For instance I want weight[a]:=3, weight[b]:=5, etc. I tried to do this using the ...
- 65