How to make a dictionary of arrays?

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Solarmew
Solarmew 2015-5-22
回答： Geoff Hayes 2015-5-23
I can't seem to figure out how containers.Map works... It's doing ok with characters and numbers, but flips out when I try to feed it arrays. How do I make something like this?
function test
global a
a = containers.Map();
a(pi) = 3:14;
a(5) = 4:2:10;
end
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Solarmew
Solarmew 2015-5-22
oh, i think i know why ... it probably thinks i'm trying to access "pi"'th element in that array where what I'm actually trying to do is create a key a(pi) that will return 3:14 array ... Does anyone know how to fix this?

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Geoff Hayes
Geoff Hayes 2015-5-23
Solarmew - the default KeySet type for a container is char (see containers.Map for details) and so when you try the above, you probably see the following error message
Error using containers.Map/subsasgn
Specified key type does not match the type expected for this container.
The above error makes sense since your key of pi or 5 are of type double (or single). Since you want your keys to be doubles then just define the KeySet and _ValueType* properties as
a = containers.Map('KeyType','double','ValueType','any');
which means that
a =
Map with properties:
Count: 0
KeyType: double
ValueType: any
And so you can now use pi or 5 as a key
a(pi) = 3:14;
a(5) = 4:2:10;
Try the above and see what happens!

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