[sage-support] Re: substitution in list
Besides the pure python options pointed above, if your list is filled by
symbolic expressions, you can also turn it into a vector and do the
substitutions straightforwardly.
Given
x = list(var('x', n=10))
ep = list(var('epsilon', n=10))
a random sublist
my_list = [x[randint(0,8)] for _ in range(6)]
and a substitution rule
subs_rule = dict(zip(x[4:], ep))
You can make
my_vec_list = vector(my_list).subs(subs_rule)
and turn back to a list
my_list2 = list(my_vec_list)
Em terça-feira, 28 de dezembro de 2021 às 15:03:51 UTC-3, Nils Bruin
escreveu:
> That's a python question. See for instance,
>
>
> https://stackoverflow.com/questions/2582138/finding-and-replacing-elements-in-a-list
>
> If you scroll down, there are some suggestions there that deal with
> multiple replacements as well
>
> On Tuesday, 28 December 2021 at 06:09:35 UTC-8 cyrille piatecki wrote:
>
>> First I have seen that perhaps my question has an answer in AskSagemath
>> but currently it doesn't answer.
>>
>> Suppose I have a list of variables x_1, x_2, x_3,...x_n
>>
>> I have some sub-list of variables say [x_4, x_1, x_6...]. But whenever
>> x_4, x_5,x_6 belong to this list I want the substitution x_4 ->epsilon_0,
>> x_5 -> epsilon_1... (this is an only an example. Is there a way to do this
>> in the same way that we have a substitution in a fonction in Sagemath?
>>
>
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[sage-support] Re: substitution in list
That's a python question. See for instance, https://stackoverflow.com/questions/2582138/finding-and-replacing-elements-in-a-list If you scroll down, there are some suggestions there that deal with multiple replacements as well On Tuesday, 28 December 2021 at 06:09:35 UTC-8 cyrille piatecki wrote: > First I have seen that perhaps my question has an answer in AskSagemath > but currently it doesn't answer. > > Suppose I have a list of variables x_1, x_2, x_3,...x_n > > I have some sub-list of variables say [x_4, x_1, x_6...]. But whenever > x_4, x_5,x_6 belong to this list I want the substitution x_4 ->epsilon_0, > x_5 -> epsilon_1... (this is an only an example. Is there a way to do this > in the same way that we have a substitution in a fonction in Sagemath? > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/764fe9f5-d8b3-4033-afcf-183474f5e318n%40googlegroups.com.
[sage-support] substitution in list
First I have seen that perhaps my question has an answer in AskSagemath but currently it doesn't answer. Suppose I have a list of variables x_1, x_2, x_3,...x_n I have some sub-list of variables say [x_4, x_1, x_6...]. But whenever x_4, x_5,x_6 belong to this list I want the substitution x_4 ->epsilon_0, x_5 -> epsilon_1... (this is an only an example. Is there a way to do this in the same way that we have a substitution in a fonction in Sagemath? -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/32a9656d-015d-411a-9c38-102c1e7c7be5n%40googlegroups.com.
