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Retrieving data from structures

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Ashlee
Ashlee 2012-10-26
I am working on a function for the periodic table that when I input a property and group number, the output is the requested property of the atom belonging to the requested group number. I have already created a structure for the first 18 elements that I know works. It holds the properties: atomic number, group, period, and symbol.
If I have: function periodictable(property,groupnumber), how would I be able to extract the data...if that makes sense.
Example:
>> periodictable('symbol',2) ans = 'Be' 'Mg'
>> periodictable('atomicnumber',1) ans = [1] [3] [11]
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Matt J
Matt J 2012-10-26
See my solution below, then.

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Matt J
Matt J 2012-10-26
编辑：Matt J 2012-10-26
I'm assuming you have a structure array, yourstruct, and that yourstruct(i) corresponds to the i-th element.
idx=[yourstruct.group]==number_to_search;
out = {yourstruct(idx).(property)};

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Ryan G
Ryan G 2012-10-26
编辑：Ryan G 2012-10-26
Assuming your structure is like:
periodicTable.Helium periodicTable.Carbon etc...
names = fieldnames(myTable);
inGrp = cellfun(@(x) periodicTable.(x).group==groupnumber,names);
grpNames = names(inGrp);
output = cellfun(@(y) periodicTable.(y).('symbol'),grpNames)
Where you would replace symbol with the variable you choose, not in single quotes.

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