input string data in the function

Question

Muhammad 2021-5-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/841620-input-string-data-in-the-function

评论： Adam Danz 2021-5-28

function compare_cases(country1,names,days,avg_days,dailycases)
IndexC = strfind(names,'country1');
 [row,col] = find(not(cellfun('isempty',IndexC)))
 dailydata= dailycases(row,:);
bar(days(1:end-1),dailydata);
end

my workspace has following loaded files

names 332*2 double
days 1*430 datetime
dailycases 332*429

when i call function i have to put the name of the country in place of 'country1'

% calling fuction to trace the data of china in the 'names' folder
compare_cases(China,names,days,430,dailycases)

but it doesnot intake string data

country1 in the function is not taking input an string data

what should be done,

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Answer 1

Adam Danz 2021-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/841620-input-string-data-in-the-function#answer_710800

编辑：Adam Danz 2021-5-27

在 MATLAB Online 中打开

You're not using the contry1 variable at all in your function. Instead, you've replace it with a character vector 'county1' which is not a variable. Remove the single quotes,

IndexC = strfind(names,country1);

I assume that your first input China is a variable

China = 'China';

Also note that strfind is a case-sensitive search. To avoid problems with cases, consider using

IndexC = strfind(lower(names),lower(country1));

Another problem is that strfind will accept partial matches. For example,

names = {'Korea','North Korea'}; % using "South Korea" would fix this, too
country = 'Korea'; 
strfind(names, country)
ans = 1×2 cell array
    {[1]}    {[7]}

To eliminate this problem and to improve code efficiency, consider using ismember or strcmpi

strcmpi(names, country)
ans = 1×2 logical array
   1   0

Another big problem is, according to your workspace description, names is a numeric matrix so how do you expect there to be a string match between a word 'China' and numbers?