I would like to store each iteration of a for loop into a row vector, in order. This particular problem does not start with a vector, but instead with separate scalar user inputs that must be placed into a vector. How do I achieve this? Thanks!

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Jenel Darland 2017-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/328016-i-would-like-to-store-each-iteration-of-a-for-loop-into-a-row-vector-in-order-this-particular-prob

评论： Star Strider 2017-3-4

Random variables seem to be placed into a row vector instead. I've been trying for hours and can't figure this out.

num=input('Enter the number of data points: ');
      decimal=input('Enter the number of decimals you want to show: ');
      for c=1:1:num
          dp=input(sprintf('Data Point #%0.0f: ',c));
          Vector=dp(1,c)
          output(c)=Vector
      end

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Answer 1

Star Strider 2017-3-4

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在 MATLAB Online 中打开

I prefer the inputdlg function to input. so I use it here. Change it back if you like. (I do not recommend it, though!)

This code seems to do what you want —

numc=inputdlg('Enter the number of data points: ');
num = str2num(numc{:});
decimalc=inputdlg('Enter the number of decimals you want to show: ');
decimal = str2num(decimalc{:});
for c=1:1:num
    dpc=inputdlg(sprintf('Data Point #%0.0f: ',c));
    dp = str2num(dpc{:});
    Vector(c)=dp;
    output(c)=Vector(c)
end

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Stephen23 2017-3-4

编辑：Stephen23 2017-3-4

inputdlg returns strings, which must be converted to numeric. That is why str2num is used. Even better would be to use str2double, which is more robust, faster, and gives predictable output when the input is unexpected.

Star Strider 2017-3-4

@Jenel Darland — My pleasure! I very much appreciate your compeliment! I prefer inputdlg because it doesn’t clutter my Command Window. It’s also more robust, since it can accept strings and numbers in one call. They have to be parsed subsequently, but this is easy.

@Stephen — The str2double function didn’t always work with arrays (it does now), so I got used to using str2num. Your observations on str2double are correct, and noted.

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I would like to store each iteration of a for loop into a row vector, in order. This particular problem does not start with a vector, but instead with separate scalar user inputs that must be placed into a vector. How do I achieve this? Thanks!

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I would like to store each iteration of a for loop into a row vector, in order. This particular problem does not start with a vector, but instead with separate scalar user inputs that must be placed into a vector. How do I achieve this? Thanks!

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