Replacing a string

2012 2 13
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I have a set of strings is it possible to replace it by values
for example in excel if i have strings as
private public employed unemployed
is it possible to replace values by 0.1,0.2,0.3,0.4

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TAB
TAB 2012-2-13

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[num, txt]=xlsread('Book1.xls');
txt=strrep(txt,'private','0.1');
txt=strrep(txt,'public','0.2');
txt=strrep(txt,'unemployed','0.4');
txt=strrep(txt,'employed','0.3');
Val = str2double(txt);

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