How do I create variable names from string variables

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If I have 2 variables, ID has a column of strings like 'height' or 'speed', data has a column of corresponding variables.
ie
ID = 'height' 'height' 'height' 'speed' 'speed'
data = 10;10;7;2.4;2.1
How do I create the variable 'height' and a variable speed with the corresponding data.
ie
height = 10;10;7
speed = 2.4;2.1

Risposta accettata

Matt Kindig
Matt Kindig il 12 Ago 2013
Modificato: Matt Kindig il 12 Ago 2013
Instead, make them fields of a structure. You can do something like this:
vars = struct(); %structure to hold your variables
ID = {'height' 'height' 'height' 'speed' 'speed'};
data = [10;10;7;2.4;2.1];
fields = unique(ID); %get variable names as field names
for k=1:length(fields), %for each unique variable
fld= fields{k}; %field name
tf = ismember(ID, fld); %which corresponding data
vars.(fld) = data(tf); %assign to field
end
vars.height; %height variables
vars.speed; %speed variables
  2 Commenti
selena
selena il 12 Ago 2013
Thanks, how would I assign a date stamp to the variables?
Matt Kindig
Matt Kindig il 12 Ago 2013
How do you mean? Do you have an additional field in 'ID' that is called 'date' or similar? I wrote this code to be extensible to an arbitrary set of fields, so I think that additional ID elements (with corresponding values in 'data') should work fine.

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Più risposte (1)

Andrei Bobrov
Andrei Bobrov il 13 Ago 2013
Modificato: Andrei Bobrov il 13 Ago 2013
ID = {'height' 'height' 'height' 'speed' 'speed'};
data = [10;10;7;2.4;2.1];
[i0,i1,i1] = unique(ID);
vars = cell2struct(accumarray(i1(:),data(:),[],@(x){x}),i0,1);
  1 Commento
Matt Kindig
Matt Kindig il 15 Ago 2013
I should have figured there was an easy way to do this using accumarray. Try as I might, I still can't get the hang of that function.

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