Question about ordered pairs and dictionaries.

asked 2012-11-16 15:25:48 +0200

Siramok
1 ●1 ●2

updated 2012-11-17 08:59:20 +0200

calc314
4191 ●22 ●48 ●113

Hello, what I am trying to do is use (math) functions within functions that are defined by ordered pairs. The code I have looks like this:

 f = {-3:4, -2:2, -1:0, 0:1, 1:3, 2:4, 3:-1}
    g = {-3:-2, -2:0, -1:-4, 0:0, 1:-3, 2:1, 3:2}
 show(g[f[g[0]]])

So, the way I intend for this to work is g[0] should return 0, which will become f[0] which returns 1, which becomes g[1] which should return -3. When I try to run this in sage 5.4, nothing appears to happen. Any help would be really great, thanks!

answered 2012-11-16 21:15:47 +0200

fidbc

2423 ●4 ●26 ●61

updated 2012-11-16 21:59:25 +0200

Hi, the code above seems fine, the output of the show function was a pdf file containing -3. Maybe just

f = {-3:4, -2:2, -1:0, 0:1, 1:3, 2:4, 3:-1}
g = {-3:-2, -2:0, -1:-4, 0:0, 1:-3, 2:1, 3:2}
g[f[g[0]]]

If you want the result printed then

f = {-3:4, -2:2, -1:0, 0:1, 1:3, 2:4, 3:-1}
g = {-3:-2, -2:0, -1:-4, 0:0, 1:-3, 2:1, 3:2}
print g[f[g[0]]]

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Comments

I really appreciate you checking it, but strangely enough, now when I try evaluating the above code I get an error: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "_sage_input_3.py", line 8, in <module> _interact_.SAGE_CELL_ID=1 NameError: name '_interact_' is not defined

Siramok ( 2012-11-16 21:42:14 +0200 )edit

The code in your question contains a syntax error and I can't edit it. I'll update the answer above to include it.

fidbc ( 2012-11-16 21:57:03 +0200 )edit

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