Help creating loop that converts text to numbers

Hi, this is a follow-up on a question I asked yesterday.

I have a loop that asks the user to input sentences until the word 'end' is typed.

After the loop has ended, I want it to display the sentences typed as inegers, using the "char" command

ex

char([101 102 103])

but reversed since it would be taking the letters and converting them to integers.

Here is what I have so far.

The other loop to execute this specific function is probably extremely wrong but I am an absolute beginner and was just trying to follow a similar format to the first loop I recieved some help with yesterday.

clc 

N=input('what is N?: ') %establishes N
all_A = {};
while true
  A = input('give me a sentence!: ','s'); %asks user for sentence input
  if strcmpi(strtrim(A), 'end'); 
      break; 
  end %will end the loop if end is typed
  all_A{end+1} = A;
end
all_B={};
while false
  B= input('give me a sentence!: ','s');
  if strcmpi(strtrim(B));
      num2str(char[B])
  end
end

Answer 1

[dpb]

>> A='Now is the time...';
>> format short
>> disp(double(A))
    78   111   119    32   105   115    32   116   104   101    32   116   105   109   101    46    46    46
>> char(double(A))
ans =
    'Now is the time...'
>> 

The converse of char() is simply one of the numeric classes; by default everything numeric in MATLAB is double so I used it. Could just as well have used

>> int8(A)
ans =
  1×18 int8 row vector
    78   111   119    32   105   115    32   116   104   101    32   116   105   109   101    46    46    46
>> 

[Alex Skantz]

This works however I need to get all the sentences converted to integers before the word "end" is typed. This code only seems to work for the last sentence. Any way I can go about doing that?

I edited your text example so it looks like:

A=input('give me a sentence!: ','s');
format short
disp(double(A));

because it was only showing the numbers for the example sentence you used which was "Now is the time..."

I wanted it to look something like :

Give me N: 10
Give me a sentence: hello goodbye
Give me a sentence: goodbye hello
Give me a sentence: end

and then it would display:

104   101   108   108   111 103   111   111   100    98   121   101
103   111   111   100    98   121   101 104   101   108   108   111

[dpb]

You'll need to save the input from the user as a cellstr array or string array as it is being entered and then loop over however many elements there are after the input loop is finished to get the input/output in that order.

NB: you definitely don't need the format statement everywhere; I just had it because for what I am doing locally, I'm using the bank format which would display two decimals that I didn't want to clutter up the post.

A=[];
while true
  s = input('give me a sentence!: ','s'); %asks user for sentence input
  if strcmpi(strtrim(s), 'end'); 
      break; 
  end %will end the loop if end is typed
  A=[A;string(s)];
end
for i=1:snumel(A)
  disp(double(A{i})
end

may be close.

NB: AIR CODE! UNTESTED!

[Alex Skantz]

so the code is almost perfect but instead of displaying numbers it just displays 'NaN'. I apologize for the inconvenience but as I am an absolute beginner I truly am unsure what can do to fix it. Any other suggestions?

[dpb]

As noted, UNTESTED code...I had never tried double on a string; I presumed it would behave as expected; turns out it doesn't. A string variable is higher abstraction and contains a cellstr() underneath, but to convert to underlying numeric turns out you have to explicitly address that content -- "Use the curlies, Luke!"

  disp(double(A{i})