Questions tagged [expression-construction]
The expression-construction tag has no usage guidance.
108
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Convert string to function with an argument
I am trying to build an expression by first writing it out as a string and then using ToExpression to convert it to an expression. However, I cannot figure out how to make expression recognize x as an ...
- 565
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5
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Create a list of all possible multivariate monomials of a certain order
Given variables x[i] for i=1,2,...,n I would like to create a list of all possible multivariate monomials of order ...
- 12k
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What is the meaning of #, Root and & [duplicate]
I am new, but can any one tell me what is the meaning of formulas of x and y in the picture?
- 101
3
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3
answers
360
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Specify number of elements instead of step in Table [duplicate]
I think I have seen what I was looking for a ong time ago but I can't see nothing such in documentation.
Quite often, I would like to create a Table with given ...
- 14.4k
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104
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How to obtain differential consequences of linear transport equation automatically?
Motivation
Here I've asked how to derive coefficients of numerical approximation of the linear transport equation
$$
u_t + u_x = 0,
\tag{1}
$$
on a fixed 3-point stencil automatically and here I've ...
- 119
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66
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Misunderstanding of Replace code
I am looking for the right way to replace $\delta \, \, \text{by} \, \, 0.05 \, \, \, \beta \, \, \, \text{by} \, \, \, 1.77 \, \, \, \text{and} \, \, \, n \, \, \, \text{by} \, \, \, 12$ in this ...
- 411
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119
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I have a term 'Keff' in terms of 'W'. I need to write 'W' in terms of 'Keff'. Does Mathematica provide an option for that
I have read similar answers on this topic. I am still not able to execute my code.The code is as follows.
...
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65
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394
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Defining a function to use in another function dependent on similar parameters [closed]
I want to define a variable dependent function which can be used to define another function which depends on the same variable and other variables.
For example, I have a system where I define ...
- 57
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64
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Determine class of special function from algebraic constraints?
Consider vectors x_i in arbitrary dimension. Let's say I have an expression in six variables F[x_1,x_2,x_3][x_4,x_5,x_6], which ...
- 12k
4
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3
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243
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Find six vectors with rational entries under constraints?
Define six vectors v[i] with i=1,2,3...,6. Each v[i] is six dimensional and all entries in ...
- 12k
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1
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776
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How does one initialize large arrays in Mathematica with a structured format? [closed]
I want to create a 10 by 10 matrix that increases by 1 every unit across like:
1 2 3 4 5 6 7 8 9 10
11.....
Is there a function that does this without having ...
- 3
1
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3
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226
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How do I make a definition/function/method as I would in Java/MATLAB/Python
I've been trying to figure this out for a few hours now and it's driving me nuts. I am trying to confirm that, after transforming a Schrodinger equation, that the new wavefunctions satisfy the new ...
- 275
1
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1
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262
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Is there a way to convert a string to a Table indicator? [closed]
I have a list like this:
list = {"k1","k2"}
I want to use the elements in the list as Table indicators:
...
- 299
1
vote
2
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79
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Subsituting expressions for expressions
I'm trying to define functions using other functions, like so:
f[a_, b_] := a/b;
a[c_] := c;
b[d_] := d;
Now what I want to be able to do is two things:
...
- 45