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Topic: Not-understandable warning
Replies: 1   Last Post: Apr 8, 2013 12:05 AM

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Posts: 18
Registered: 12/7/04
Not-understandable warning
Posted: Apr 6, 2013 9:54 PM
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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 version and Mac OS 10.5.8.

Fujio Takata.

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