Number of variables dependent on user input

Question

P_Alpha 2015-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/248212-number-of-variables-dependent-on-user-input

评论： P_Alpha 2015-10-13

Hi Everyone, I would like to have user input for number of Securities and weights for each security in a portfolio. For Example:

numsec = ('Enter the number of securities in Portfolio: ');
numsec = input(numsec)

If the user input is "2" then

Security1 = ('Enter Security 1 Ticker: ');
Security1 = input(Security1,'s');
Security1Wt = ('Enter Security 1 Weight (ex: .25): ');
Security1Wt = input(Security1Wt);
Security2 = ('Enter Security 2 Ticker: ');
Security2 = input(Security2,'s');
Security2Wt = ('Enter Security 2 Weight (ex: .25): ');
Security2Wt = input(Security2Wt);

I want this to be dynamic so that there are Securities and Security weight variables for the number of securities in the portfolio. Sorry if I am not asking this clearly as I am a matlab rookie. Also, if any of the code I posted is ugly and can be done in a betterfashion, please let me know! Kind regards.

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Answer 1

the cyclist 2015-10-12

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https://ww2.mathworks.cn/matlabcentral/answers/248212-number-of-variables-dependent-on-user-input#answer_195704

编辑：the cyclist 2015-10-12

在 MATLAB Online 中打开

Use cell arrays:

numsec = ('Enter the number of securities in Portfolio: ');
numsec = input(numsec)
Security = cell(numsec,1);
SecurityWt = nan(numsec,1);
for ns = 1:numsec
    securityNumberString = num2str(ns);
    Security{ns} = input(['Enter Security ',securityNumberString,' Ticker: '],'s');
    SecurityWt(ns) = input(['Enter Security ',securityNumberString,' Weight (ex: .25): ']);
end

Notice that Security is a cell array, convenient for storing text. SecurityWt is a numeric array. Pay attention to where I used curly brackets instead of parentheses.