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Results tagged with expression-manipulation
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user 12750
How to manipulate expressions structurally, not necessarily complying with the rules of algebra.
1
vote
3
answers
697
views
List of Coefficients of Expression with symbolic Terms
(I am affraid that this is a duplicate, but I read several already asked questions and non of them helped me. If it's already answered, please tell me)
I have expressions like this
expr1=F1[0]*F2[3] …
- 2,192
3
votes
5
answers
679
views
Finding coefficient in expression
I have expressions like these:
expr1 = -2 a Z[-2] - 2 b Z[-1] - 2 Z[-1] + a Z[-1]
expr2 = -2 a Z[-2] - 2 b Z[-1] - 2 Z[-1] + a Z[-1] + c Z[0]
expr3 = -2 a Z[-2] - 2 c Z[-1] - 2 Z[-1] + a Z[-1] + c Z[ …
- 2,192
6
votes
3
answers
305
views
Unexpected Behaviour with local variables and ToExpression
I encountered an unexpected behaviour in my mathematica-code, and want to understand whether that's a mathematica bug, or a misinterpretation on my side.
MainVar = 1;
Carrier = "MainVar";
f[] := (
…
- 2,192
0
votes
1
answer
238
views
Patterns of function-arguments in expressions
I want a function that compares an expression with a specific pattern.
The expression has always the following form:
expr = F1[x1]F2[y1] + F1[x2]F2[y2] + F1[x3]F2[y3]
which is a sum of three terms …
- 2,192
7
votes
3
answers
488
views
Symbolic manipulation of expression with undefined function
I have an expression which is a sum of undefined function v[n1,n2,n3,n4] with 4 arguments (n_i are integers):
expr=a*v[n1, n2, n3, n4] + b*v[n5, n6, n7, n8] + c*v[n9, n10, n11, n12] + ....
Now I in …
- 2,192
3
votes
1
answer
346
views
Extracting function calls from an expression
I have an expression like this:
expr = F[0, 1] + 2 F[0, 0] - 17*F[2, 0]
and I want to transform it to a list consisting of all function calls with its arguments:
MyList = {F[0, 1], F[0, 0], F[2, 0 …
- 2,192
3
votes
2
answers
187
views
Time-efficient manipulation (zeroing) of expression
I have huge matrices in the form of
mtx1 = {{24+24 FF[6,9] GG[5,10]+24 FF[7,8] GG[5,10]+24 FF[5,10] GG[6,9]+24 FF[6,9] GG[6,9]+24 FF[7,8] GG[6,9]+24 FF[5,10] GG[7,8]+24 FF[6,9] GG[7,8]+24 FF[7,8] GG[ …
- 2,192
5
votes
4
answers
1k
views
Replace every Minus to Plus in Expression
Thought this is a rather simple thing, but I was not able to find a solution.
I have a polynomial expression like:
expr1 = a^2 - b + c * d
expr2 = a - b
expr3 = -a + b - c
and I want to replace …
- 2,192
4
votes
2
answers
224
views
Time-efficient creation of matrix
I have expressions like
xx1=FF[1, 1] GG[1, 1] + FF[1, 1] GG[2, 2] + FF[2, 2] GG[2, 2]
xx2=2*FF[1, 2] GG[1, 1] + FF[1, 1] GG[1, 2] + FF[2, 2] GG[2, 2]
and I want to transform it to special matrices
…
- 2,192
1
vote
2
answers
142
views
Fast symbolic manipulation of expression with undefined function
I have an expression which consists of terms with undefined function calls a[n]:
example = 1 - c^2 + c a[1] a[2] + 1/2 c^2 a[1]^2 a[2]^2 + c a[1] a[3]
Now I want to transform each term with individ …
- 2,192
7
votes
2
answers
231
views
Efficient Search for specific Terms in symbolic Expression
I have a large symbolic expression with six variables a,b,c,d,e,f per term, roughly like this:
expr=a^2 b c d^2 + 1/2 a b (b + I d) e^3 - 1/8 I a (c + 1/2 I (c + I d))^2 (I b + 1/2 (c + I d)) e f
I …
- 2,192