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How do you access a field in a struct? [message #18326]

Wed, 15 December 1999 00:00

Karri Kaksonen
Messages: 27
Registered: October 1999

Junior Member

Hi,

I have a small problem with accessing my structs.

The complete program (that does not work) looks like:
pro beer
a = { $
beer: 1, $
icecream: 2 $
}

b = { $
milk: 0.60, $
beer: 1.25, $
icecream: 0.75, $
tea: 0.50 $
}

totalsum = 0.0
selection = tag_names(a)
for i=0,n_tags(a)-1 do totalsum=totalsum + a.(i) * b.(selection[i])
print, totalsum
end

When I run this program I get:
IDL> beer
% Type conversion error: Unable to convert given STRING to Long.
% Detected at: BEER 16 C:\RSI\IDL52\mri\beer.pro
% Type conversion error: Unable to convert given STRING to Long.
% Detected at: BEER 16 C:\RSI\IDL52\mri\beer.pro
1.80000

The funny thing is that it obviously replaced "beer" and "icecream"
with "milk" as it could not understand that b.('beer') is the same
as b.beer

Is there a way to pass the name of the structure field as a string?

--
Regards,

Karri Kaksonen
Picker Nordstar

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How do you access a field in a struct?

By: Karri Kaksonen on Wed, 15 December 1999 00:00

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