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Re: Reading Values into Individual Array Elements [message #5991 is a reply to message #5927]

Fri, 15 March 1996 00:00

steinhh
Messages: 260
Registered: June 1994

Senior Member

In article <4i2qfi$3et@news.isc.rit.edu>, Rolando Raqueno <rvrpci@cis.rit.edu> writes:
|>
[...snip...]
|>
|> However, when I try to use a specific element in the array as an
|> argument to the READ statement, IDL no longer prompts me for the
|> value but returns value of the element as shown below.
|>
|> IDL> read,a(3)
|> 4.00000IDL>

Since IDL passes subscripted array elements by value and not by reference,
a(3) is effectively a constant to READ, because READ cannot change
the value of a(3). What you are saying to IDL is therefore basically the
same as:

IDL> read,"TEST"

which is supposed to show the behaviour you described.

|>
|> A workaround would be to use a scalar temporary variable and then
|> assign it to the specific element, but that seemed a bit circuitous
|> and not unlike other languages.
|>

It's a little tedious, but it's the correct solution in this case.

Stein Vidar

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[Message index]

		Reading Values into Individual Array Elements By: Rolando Raqueno on Tue, 12 March 1996 00:00
		Re: Reading Values into Individual Array Elements By: steinhh on Fri, 15 March 1996 00:00
		Re: Reading Values into Individual Array Elements By: Ken Knighton on Mon, 15 April 1996 00:00
		Re: Reading Values into Individual Array Elements By: Rolando Raqueno on Sat, 13 April 1996 00:00

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