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Expression question [message #54266]

Wed, 30 May 2007 14:05

shd
Messages: 4
Registered: June 2006

Junior Member

Code:
=========================
pro shd_test

st = {a:0, b:0}

arr = [st, st, st, st, st]

help, st
help, arr[0]
help, (arr[0]).a
help, arr.a
help, (arr.a)[0]

st.a = 1
arr[0] = {a:1, b:0}
(arr[0]).a = 1
;(arr.a)[0] = 1
end
===========================

Output:
===========================
IDL> shd_test
ST STRUCT = -> <Anonymous> Array[1]
<Expression> STRUCT = -> <Anonymous> Array[1]
<Expression> INT = 0
<Expression> INT = Array[5]
<Expression> INT = 0
Attempt to store into an expression: Structure reference.
Execution halted at: TEST_ODDITY 15 C:\Dev\IDL\projects\test
\test_oddity.pro
$MAIN$

===========================

I can assign a value to "arr[0]" and not "(arr[0]).a". I also tried
"(arr.a)[0]" and got a similar error. What am I missing here?

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