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# Get data from a Cellstr

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James Knight on 22 Oct 2019
Closed: MATLAB Answer Bot on 20 Aug 2021
Hi
I have a Cellstr and I want to call the data from it 5 numbers at a time, so the user enters the text, and a binary value is stored in the cellstr depending on the ASKI value of the character entered, I want to call the binary values 5 at a time and use strrep to replce them with a character depending on the value of the binary number
Hopefully this makese sense!
Thanks
usertext = input('Enter your text message :','s');
usertext = usertext;
binary = cellstr(num2str(double(usertext) < 95));
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James Knight on 22 Oct 2019
Sorry! My code
usertext = input('Enter your text message :','s');
usertext = usertext;
binary = cellstr(num2str(double(usertext) < 95));
Takes the usertext input and based if the ASKI value of the character is above 95 places a binary value in a cellstr.
I want to use the binary values (in blocks of five) , to use something like Strrep to replace the binary numbers with letters based on a code EG:
10001 = A
10101 = B
So if I entered 'TestINgOnE' my Cellstr would store : 1 0 0 0 1 1 0 1 0 1
and based on my key the output would be AB
Hopefully that makes abit more sense.
James Knight on 22 Oct 2019
usertext = input('Enter your text message :','s');
usertext = usertext;
binary =(num2str(double(usertext) < 95));
str = binary;
j = 1;
for k = 1: 3: length(str)
j = j+1;
end

dpb on 22 Oct 2019
On the presumption there's a much larger lookup table in the real application...
X=[17,21]; % lookup table independent value
Y=[1,2]; % output position for code
C=['AB']; % desired code
b=repelem('0',numel(txt));b(txt<95)='1'; % build the binary string from input
b=bin2dec(reshape(b,5,[]).'); % convert 5 bits to decimal
code=C(interp1(X,Y,b))
ans =
'AB'
>>
James Knight on 23 Oct 2019
Its the X and Y Intercepts I dont really undestand
dpb on 23 Oct 2019
Edited: dpb on 23 Oct 2019
X/Y are the lookup table -- the X is the numeric value associated with the Yth code index -- it's indirect because interp1 won't allow char() variables as the Y vector. b is the decimal value of the binary string created by the logical operation on the input string (in 5 bit lengths).
interp1 returns the Y associated with the input X as an array of indices into the C code characters...for robustness would want to ensure all the b exist in X (iow, the code is defined for all the inputs given. For length of 5, that's 2^5 elements.)
You could write it as character strings instead and use string operations, but it's more concise to convert those to numeric in the lookup table and then convert the user input as well.