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Results tagged with pattern-matching
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user 96078
Questions on expression testing and manipulation through pattern matching and constructing efficient patterns.
2
votes
Taking some terms from a polynomial
You can adapt Yode's method from his answer to: Removing terms of certain degree in multivariable polynomial
var={x,y};
Sort@Select[MonomialList[ser], Tr[Exponent[#, var]] < 5 &]
$$\left\{1,-\f …
- 3,643
2
votes
Identify complex expression and replace
You could do it semi-manually:
MYoverMOD = (-Sin[ang] mzX + Cos[ang] mzY);
MXoverMOD = (Sin[ang] mzY + Cos[ang] mzX);
modSquared = (1 - mz^2)/(mzX^2 + mzY^2);
deriv = D[mx, t];
deriv /. {modSquared - …
- 3,643
8
votes
2
answers
316
views
Dividing a list into $n$ non-overlapping pieces?
Is there a function that gives all the ways a list can be divided into a specified number of non-overlapping pieces, where the order is maintained?
I can do this with Table. For instance, if the list …
- 3,643
3
votes
1
answer
289
views
Replacement rule to display negative exponents as denominators
Suppose I have an expression of the form:
expr=f[t]^b + f[t]^a g[t]^-a + g[t]^-c
And I want to create a rule to convert negative exponents to denominators. In the above example, this could be achi …
- 3,643
0
votes
Making strict replacements in Mathematica
Considering all of your test cases:
Unevaluated[1/n1/n2/n3/n4 + n5/n1/n2/n3/n4] /.
{HoldPattern[1/n1/n2/n3/n4] -> a, HoldPattern[n5/n1/n2/n3/n4] -> b}
a + b
Unevaluated[n2/n3/n4/n5 + n1*n2 …
- 3,643