How to convert string to numeric variable in if statement

Question

Ot 2014-3-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/120283-how-to-convert-string-to-numeric-variable-in-if-statement

评论： Giorgos Papakonstantinou 2014-3-5

采纳的回答： Jos (10584)

在 MATLAB Online 中打开

I want to covert my string variable into numeric variables.

I have got string Variable Team that shows which players are in. For example C2, C1, B2, B1 etc.

I want to give each player a numeric value which represents the team.

I tried the following

for i =1:length(Team)

    if Team(i) strcmp 'C1'
        Team(i) = 1
    elseif Team(i) strcmp 'C2'
        Team(i) = 2
    end
end

but get the error:

??? Conversion to logical from cell is not possible.

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Answer 1

Jos (10584) 2014-3-5

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在 MATLAB Online 中打开

AllTeams = {'A1','B1','C1','C2','C3'} % all the teams
Team  = {'A1','B1','C1','A1','C3','A1','unknown','C1'} % Team{k} is the team of player k is
% map team names to numbers
[~,TeamNumber] = ismember(Team, AllTeams)
X = find(TeamNumber <= 2)  % players in team 1 or 2

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Answer 2

Chandrasekhar 2014-3-5

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for i =1:length(Team)

    if Team(i)== str2num(C1)
        Team(i) = 1
    elseif Team(i)==str2num(C2)
        Team(i) = 2
    end
end

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Chandrasekhar 2014-3-5

Ok..can you explain the logic clearly

what does the array team contain? and what exactly you want to find?

Ot 2014-3-5

编辑：Ot 2014-3-5

The array team is an (801X1) cell. The Team cell tells for each of the 801 players in the Database in which team they play. The string values B1, B2, C1 and C2 are the names of the different team.

I want to adress an numeric value to each Team instead of this string value, so that I afterwards can sort the players based on their teams and calulate Mean Sprint times and STD of each Team's sprint times.

I hope it is clear now.

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Answer 3

Giorgos Papakonstantinou 2014-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/120283-how-to-convert-string-to-numeric-variable-in-if-statement#answer_127173

编辑：Giorgos Papakonstantinou 2014-3-5

在 MATLAB Online 中打开

If this is exactly what you want to do then try this:

Team = {'C1' 'C2' 'C3' 'C4'}
for ii=1:length(Team)
    switch Team{ii}
        case 'C1'
            Team{ii} = 1;
        case 'C2'
            Team{ii} = 2;
        case 'C3'
            Team{ii} = 3;
        case 'C4'
            Team{ii}=4
        otherwise
            fprintf('hallo')
    end
end