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Newest 'replacement' Questions - Mathematica Stack Exchange
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1,704 questions
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0
votes
0
answers
96
views
Repeated substitute shortened with "Map"
I have an expression e[x,y,z] and like to see all results when picking all independent variables from a fixed set of constants ...
- 1,223
2
votes
2
answers
103
views
How can I reduce the degree of a polynomial in two variables by substitution?
This is similar to the how-to-replace-variable-with-power question, but here it involves two variables with different power combinations.
This quesion arises from paper forward kinematics of the 6-6 ...
2
votes
3
answers
154
views
Removing unmatched elements from nested list after ReplaceAll
I'm doing some heavy symbolic calculations and for preliminary simple tests I need to replace all coefficients except some choosings, e.g.:
...
0
votes
2
answers
100
views
Why does a replacement rule fail for a custom defined function but works for a generic symbol?
I'm pretty new to Mathematica and I have a question about how to deal with replacement rules in presence of function definitions.
Basically I want to implement a mean/covariance calculator, in the ...
5
votes
1
answer
244
views
Understanding difference between {{{a}}} /. {x_} :> q[x] and {{{a}}} /. List -> q [closed]
Following Shifrin's "Mathematica Programming: an advanced introduction", pp. 93-94,
I entered
{{{a}}} /. {x_} :> q[x]
and I got, as expected by the ...
1
vote
2
answers
95
views
multivariate chain rule with Replace[] [closed]
f'[x] /. f -> (f[g[#]] &)
adopts the chain rule. Now I need df(r,$\theta$)/dr in x and y coordinates, hence transforming from polar to Cartesian coordinates,...
- 461
2
votes
2
answers
109
views
Associations in replacement rules variable
I have a large number of replacement rules where the right hand side (RHS) is always the same. To avoid repetition, I separated the two sides to add the same RHS to all of them.
This is a minimal ...
1
vote
1
answer
97
views
Why Cannot I Apply the Replace Rule Here?
I want to replace
$p_\_\sum_{i=1}^{m_\_}Log[x[i]]^{b_\_} x[i]^{a_\_}$ with $p*T[a,b,m]$, but it doesn't work. Can anyone give me a help? Thanks in advance!
Codes:
...
1
vote
1
answer
178
views
Replacement is not working in Table
What is exactly happening here?
Table[{(x^2 + y), (x^2 + y) /. x -> 2}, {x, 0, 3}]
As the output I am getting:
...
3
votes
4
answers
992
views
How to only replace x^1 not x^n
Is there a better way to replace a variable, not powers of it, than first to replace all unwanted terms by dummy terms and replacing them back later?
Input: ...
- 1,706
9
votes
6
answers
583
views
Pure function + Apply + ReplaceAll
I've been finding myself using the following construction as of late:
ReleaseHold[Hold[s #^2 & /@ Range[s, 5]] /. s -> 2]
which is the lazy version that ...
1
vote
1
answer
113
views
substituting functions into polynomials
I've seen posts on changing functions inside a derivative expression such as this but my problem is a little different. I want to substitute a function given symbolically, which doesn't seem to be ...
- 123
4
votes
0
answers
93
views
Why can't you get a numerical value with a replacement rule? [duplicate]
N[π] outputs 3.14159, but N[x]/.x->π outputs π.
What'...
1
vote
1
answer
82
views
force evaluation [closed]
I can't figure out how to get MMA to evaluate a dot product inside a module:
...
- 123
0
votes
2
answers
143
views
Taking complex conjugates via $i\to -i$ [closed]
I am taking the complex conjugate of the hydrogen wavefunctions (which have variables in it), thus I do so as follows:
psi/. I-> -I
This worked for some of the ...
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