type() is one very helpful function in SAGE to know about data kinds
print type(T)
returns
<type 'list'>
so T is not strictly an "array" but a "list".
your knowledge is mixing with other programming languages where [ and ] are
special characters to get one element of an array.
(some computer men will say to you: it's same, only difference, is list as
no defined maximum number of elements)
to get first element of this list in SAGE : use T[0]
print T[0]
returns
t == 1
you can ask: what is it ? answer: simply first element of list: an
"equation"
next question: how can I get "t" ? answer: get the left hand part of
equation: T[0].left()
print T[0].left()
returns
t
next question: how to assign "x" with "t" ? answer: not assignement of
value but substitution
x = T[0].left() ; print x
returns
x
next question: which value has x ?
print x
returns
t
Argh...I don't want this, but I want x has the same value than t ? answer:
t has NO value, because t == 1, is not an "assignment" but an "equation"
x = T[0].right()
print x
returns
1
OK..now x has value 1, and no relation anymore with t.
To be 1 or not to be 1, was it the question ?
On Sunday, 23 February 2014 05:39:54 UTC+1, Santanu wrote:
>
> Following code I want to assign a value.
>
>
> var('a,t,x')
> T=[t==1, a==2]
>
> Now I want to make x=t which is 1 in this case.
> That is x will be 1.
>
>
>
>
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