Unexpected MATLAB operator during using isnumeric and isletter

Question

jarvan 2014-11-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/163160-unexpected-matlab-operator-during-using-isnumeric-and-isletter

评论： Orion 2014-11-19

I am writing a function that prompts the user for a number immediately followed by a letter of the alphabet. The format should be number first then letter after. I got error when I called the function up , I typed 123d and it said Unexpected MATLAB operator.

Here is the example:

Enter a letter and a #: xyz4.5t
Error!
Enter a letter and a #: 3.21f
num =
3.2100
let =
f

And here is my code

function[num let] = readthem(word)
    fprintf('Please enter a number immediately followed by a letter of the alphabet \n')
      word = input('Enter a letter and a #: ') 
      while isnumeric(num)==0 || isletter('let')== 0 
          word = input('Enter a letter and a #: ') 
      end
          sprintf('You enter %d%s',num,let)
end

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Answer 1

Orion 2014-11-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/163160-unexpected-matlab-operator-during-using-isnumeric-and-isletter#answer_159318

编辑：Orion 2014-11-18

在 MATLAB Online 中打开

Jarvan,

you misused the call to input

when you use

word = input('Enter a letter and a #: ')

Matlab expects the user to give a valid expression, not a string.

what you want to do is to give a string as input, so, just do

word = input('Enter a letter and a #: ','s') % add a second argument to _input_ to consider the input as a  string.

and then you can decompose the data word in two parts num and let .

Note : in your code, num and let are not calculated ?!

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jarvan 2014-11-19

I also know I can use [num let] = strtok to display what user just input, however, I don't know where should I put during using function

Orion 2014-11-19

在 MATLAB Online 中打开

in a simplier way

function [num,let] = readthem()
fprintf('Please enter a number immediately followed by a letter of the alphabet \n');
word = input('Enter a letter and a #: ','s');
let  = word(isletter(word));
num  = word(~isletter(word));
fprintf('You entered %s %s',num,let);
end