Using a variable in an input prompt

Question

lsutiger1 2015-11-6

1
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https://ww2.mathworks.cn/matlabcentral/answers/253341-using-a-variable-in-an-input-prompt

回答： Steven Lord 2024-9-28，16:01

I am trying to use the iterator (ii) of my for loop as a string in my input prompt. The code is shown below

for ii = 1:n
  x = input('What is the orientation of molecule ' num2str(ii) 'in the x-direction?');
end

but this does not work. Any suggestions?

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lsutiger1 2015-11-6

Thank you to all who replied! Much appreciated!!

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Answer 1

Walter Roberson 2015-11-6

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    x = input(['What is the orientation of molecule ' num2str(ii) 'in the x-direction?']);

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lsutiger1 2015-11-6

Thank you!

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Answer 2

Wanbin Song 2015-11-6

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Input argument of 'input' function should be a text.

Your code shows that your input arguments of 'input' function consists of three string.

Just combine them as below.

for ii = 1:n
     x = input(['What is the orientation of molecule ' num2str(ii) 'in the x-direction?']);
end

Then it will work.

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lsutiger1 2015-11-6

Thank you!

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Answer 3

Steven Lord 2024-9-28，16:01

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Another possibility you can use in recent releases of MATLAB (since I think release R2016a) is to use a string array.

ii = 5;
promptMessage = "What is the orientation of molecule " + ii + " in the x direction?"
promptMessage = "What is the orientation of molecule 5 in the x direction?"

You could then pass promptMessage into the input function (or directly construct the prompt message inside the input call.) I didn't show that because calling input is not supported on MATLAB Answers.