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sage -c "print diff(x^4,x)"

asked 2012-10-13 03:19:19 -0500

xuwang gravatar image

updated 2013-05-09 08:26:23 -0500

tmonteil gravatar image

I'm using 5.3 on Ubuntu 64 bit.

I would like to have the following print 4x^3 to standard out.

$ ./sage -c "print diff(x^4,x)"
Traceback (most recent call last):
  File "/home/xuwang/sage/local/bin/sage-eval", line 15, in <module>
    eval(compile(s,'<cmdline>','exec'))
  File "<cmdline>", line 1, in <module>
NameError: name 'x' is not defined
$
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You can explicitly declare x as a variable: `sage -c "var('x'); print diff(x^4,x)"`

John Palmieri gravatar imageJohn Palmieri ( 2012-10-13 05:26:14 -0500 )edit

The question remains of why `./sage -c` doesn't behave the same as Sage proper. Sage does have `x` predefined, like it or not.

kcrisman gravatar imagekcrisman ( 2012-10-13 11:36:52 -0500 )edit
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answered 2013-04-17 13:42:42 -0500

tmonteil gravatar image

This bug was fixed in Sage 5.4.1. Thanks for reporting it . Now, you will get

$ sage -c "print diff(x^4,x)"
4*x^3

:)

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Asked: 2012-10-13 03:19:19 -0500

Seen: 91 times

Last updated: Apr 17 '13