Azzera filtri
Azzera filtri

How to create a numerical variable from a string stored in a cell array ?

1 visualizzazione (ultimi 30 giorni)
I have a cell array that looks as follows:
countrycode = {'ALB';'ALB';'ALB';'ARG';'ARG';'BRA';'BRA';'BRA';'BRA'}
This is a short example, the list has about 50 countries, each with a different number of entries.
1. How can I create a numerical variable that assigns the value 1 to all 'ALB' entries, 2 to all 'ARG' entries, 3 to all 'BRA' entries and so on? 2. Is there a command akin to 'foreach' that would allow me to loop over all possible country codes? for instance, to extract data in a numerical variable associated with the variable countrycode?

Risposta accettata

Alexandra Harkai
Alexandra Harkai il 15 Mar 2017
To get the numeric values:
country_idx = findgroups(countrycode);
For the second part, it really depends on what is it exactly you want to do. splitapply till likely be a helpful, for example, to count the number of entries within each country:
splitapply(@numel, countrycode, country_idx)

Più risposte (1)

Rik
Rik il 15 Mar 2017
You can use unique to generate the list of codes, followed by ismember to find out the locations, so the result is a vector.
countrycode = {'ALB';'ALB';'ALB';'ARG';'ARG';'BRA';'BRA';'BRA';'BRA'};
list=unique(countrycode);
[~,Locb] = ismember(countrycode,list);
To my knowledge there is no foreach command in Matlab, but you can use a for-loop to loop over all the possible values. I suspect what you want may also be achieved without a loop, but you'dd have to tell us more about what exactly you want to do.

Categorie

Scopri di più su Creating and Concatenating Matrices in Help Center e File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by