Questions tagged [system-variables]
The system-variables tag has no usage guidance.
72 questions
-7
votes
2
answers
264
views
Module function corrupts string? [closed]
I have the module who should replace some elements of a matrix with checkboxes
...
- 383
2
votes
1
answer
502
views
strictly positive solution to $Ax=b$
How to find in mathematica one real strictly positive solution, if any, of $Ax=b$. A is rectangular matrix.
Thanks
- 23
3
votes
1
answer
782
views
Solving a large system of nonlinear equations
I have a system of 80 nonlinear equations with 64 variables to solve in Mathematica but it takes a lot of time (about two hours) and then it return "no more memory available" knowing that I have 8GB ...
- 81
5
votes
3
answers
572
views
Creating a variable from Reduce[] output in Mathematica
Say I have the following input:
Reduce[{t*c==50, t==5}]
the output:
t == 5. && c == 10.
Is there a way to create a ...
- 219
0
votes
1
answer
131
views
Developing Mathematica applications with IntelliJ IDEA [duplicate]
I create Mathematica application. For example testPrj. Now I want load this application for test. Here is a problem: how can I setup environment for loading my application with simple ...
- 2,898
5
votes
1
answer
293
views
Setting $RecursionLimit crashes Mathematica 10
I have encountered what I shall presume is a bug: setting $RecursionLimit repeatably crashes the Mathematica 10 kernel:
...
- 273k
5
votes
2
answers
366
views
Syntax highlighting conflict
I'm trying to syntax highlight this expression: x=$\sqrt{\pi }$//N and from various sources I've learned that x (the assigned symbol) belongs to context Global while the Pi and N belongs to System. So ...
- 5,191
2
votes
1
answer
1k
views
Importing data from excel and assigning a variable to each of its columns
How should I assign variables to the data imported from excel containing 3 columns which are time, mean and standard deviation. I want to perform operations on the three variables to get new variables....
- 93
1
vote
1
answer
1k
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How do assign an interval of values to a variable in order to use them in a function?
From my code (below) I have K1 and K2 set to zero in order to test this numerical method. However, K1 is on an interval from 0 to 32, and K2 is on an interval from 0 to 8. I would like to know if ...
- 13
0
votes
0
answers
193
views
Block, With, Module, can anyone help me understand the distinction? [duplicate]
I've been working heavily with Block[] for months in my research so I've read the documentation for the seemingly similar commands With[], Block[], and Module[].
Personally, I've had by far the ...
- 1,153
2
votes
3
answers
2k
views
Solve the system of equalities and inequalities
I have a system of expressions, in which each expression is an equality or inequality expression of the following form:
Var = Var1 + Var2
Var $\odot$ number
Var $\odot$ Var1
$\odot$ = $\leq | \geq | =...
- 415
3
votes
3
answers
328
views
Accessing temporary value of a Nest evaluation
The function Nest[] must store the temporary values in the memory somewhere (those values that would form the entries of the list which is returned by the ...
- 333
6
votes
5
answers
534
views
Is there an analogue of the Variables command for general expressions? [duplicate]
The command
Variables[poly]
gives me a list of all variables that appear in the expression poly, which involved sums, ...
- 1,088
5
votes
2
answers
210
views
Equivalent of __FILE__?
Many languages define a special identifier whose value is the path to the source file currently being processed. (For example, in C, this is done through the ...
- 11.8k
0
votes
1
answer
250
views
Solving a differential equation for a variable in a function
This may sound like a very trivial question, but I need to solve a differential equation as follows:
...
- 425
1
vote
1
answer
4k
views
How to understand and use DSolve solution
This equation is simple to DSolve in Mathematica, but I don't know how to use and understand solution.
...
- 1,129
10
votes
1
answer
328
views
Why do DateList, DateString, and AstronomicalData ignore $TimeZone?
My reading of the documentation for DateList and DateString lead me to believe that both functions use ...
- 12.9k
5
votes
1
answer
245
views
Is it safe to change the value of $TimeZone?
I'd like to configure some of my notebooks to assume all calculations using dates, times and locations (notably AstronomicalData , but others too) take place at the ...
- 12.9k
11
votes
4
answers
332
views
How to change the variables Qi's to Ri's in one or two steps
I was wondering if there is a command in Mathematica to change all the following Qi's to Ri's? For example, change Q1 to R1, Q2 to R2, etc.
...
- 319
3
votes
1
answer
410
views
How to restrict global variables to within a given notebook? [duplicate]
Possible Duplicate:
Is there a way to separate variables between multiple notebooks?
I assigned a global variable like a=10; It works in all my notebooks, but ...
- 2,304
21
votes
2
answers
5k
views
Where can I permanently modify $Path?
I've quite forgotten: what file does one modify in order to add directories to $Path globally? Specifically, I want to include ...
- 12.1k
51
votes
9
answers
3k
views
Items known by CurrentValue
CurrentValue can be used to poll the state of numerous system values such as the mouse position. Its help page doesn't list all possible items, though. An item like ...
- 66.1k