Not-understandable warning
- To: mathgroup at smc.vnet.net
- Subject: [mg130385] Not-understandable warning
- From: JikaiRF at aol.com
- Date: Sat, 6 Apr 2013 21:53:06 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- Delivered-to: l-mathgroup@wolfram.com
- Delivered-to: mathgroup-newout@smc.vnet.net
- Delivered-to: mathgroup-newsend@smc.vnet.net
Dear members:
I have a difficulty to understand programming in Mathematica.
I input the following, based on a textbook titled ``Programming with Mathematica: An Introduction" by Paul Wellin, which is published by Cambridge University Press.
mat = SparseArray[{i_, i_} \[RightArrow] 1, {4, 4}]
Then, I received an answer as
SparseArray[{i_, i_} \[RightArrow] 1, {4, 4}]
with a warning as
`` SparseArray::list: "List expected at position 1 in SparseArray[{i_, i_} \[RightArrow] 1, {4, 4}]".
In this textbook, on page 32, there appears a correct answer as follows:
SparseArray[<4>, {4,4}].
Why my Mathematica cannot understand my input?
By the way, I use Mathematica 8.0.4.0 version and Mac OS 10.5.8.
Sincerely,
Fujio Takata.
- Follow-Ups:
- Re: Not-understandable warning
- From: Bob Hanlon <hanlonr357@gmail.com>
- Re: Not-understandable warning