So I have some code where I would like to formally plug in a number value into a symbolic function without having sage calculate it.
For example, if I have;
var(x)
f(x) = x^2
c = 2
And then I put in f(c), I'd like it to return 2^2 and not 4. I imagine there must be a way to do this, but I can't seem to find it with googling. Any suggestions would be appreciated.
In Sage, what you want is called "holding" the operation.
Find more about it by searching the word "hold" on this page:
http://doc.sagemath.org/html/en/reference/calculus/sage/symbolic/expression.html
For example, compare the abs operation, without holding or with holding:
sage: SR(-5).abs()
5
sage: SR(-5).abs(hold=True)
abs(-5)
However, the hold context is not implemented for all operations.
In your case, I would use the string representation for f(x) and replace x by 2:
sage: f(x) = x^2
sage: print str(f(x)).replace('x', '2')
2^2
is there a solution for this one? finding inverse of en element wiht Ext-GCD fails due to defining polynomial converts zero in function
Asked: 2015-12-23 19:15:59 +0100
Seen: 826 times
Last updated: Dec 28 '15
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