Converint between Cell arrays and Numbers and Strings

Kash022 (view profile)

on 25 Jan 2019
Latest activity Edited by Stephen Cobeldick

on 25 Jan 2019

Jan (view profile)

Hello,
I am trying to convert a double cell array as shown to individual 8 bit cells. (I hope I have been able to frame the question correctly, if not please take a look at my screenshot)
I want to convert each contents to individual bits, like for e.g [10000111] to individual 1 0 0 0 0 1 1 1
I have tried everything from cell2num, mat2cell, cell arrays and all but keep getting errors.
Please help me in solving this; also a little background theory on what these types of cells and 'cellarrays' mean would be a great help for next time!
Thanks,
Cheers,
kash022

on 25 Jan 2019
Result=cellfun(@(x) x-'0',string(yourcellarray),'un',0)
Stephen Cobeldick

Stephen Cobeldick (view profile)

on 25 Jan 2019
"Converint between Cell arrays and Numbers and Strings"
"I am trying to convert a double cell array as shown..."
Nothing in your screenshot is related to cell arrays:
Nothing in your question is related to string arrays:
After using MATLAB for more than two years it would be a good idea to learn what the basic data classes are and how to identify them:
"also a little background theory on what these types of cells and 'cellarrays' mean would be a great help for next time!"
Why not try reading the MATLAB documentation?:
PS: this is not twitter. Please do not put ugly # symbols at the start of each tag.

on 25 Jan 2019
Edited by Jan

Jan (view profile)

on 25 Jan 2019

This obtains the digits of a decimal number:
x = 10000111;
n = floor(log10(x));
out = rem(floor(x(:) ./ power(10, n:-1:0)), 10)
>> [1 0 0 0 0 1 1 1]
I prefer this instead of the indirection of letting sprintf convert the number to a char vector and converting it back to a number.
"Cell arrays" are arrays of the class cell. These are array, which can contain elements of different sizes and classes. See:
doc cell
Example:
C = {[], 1, 1:2, 1:3, 'And a char vector also'}
If you want to store the output in one array and do not want leading zeros, you need a cell array, because the vectors have dirrent length.
x = [1, 101, 10000111];
C = cell(size(x));
nMax = floor(log10(max(x)));
P = power(10, nMax:-1:0); % Expensive power operation once only
for k = 1:numel(x)
n = floor(log10(x(k)));
C{k} = rem(floor(x(k) ./ P(nMax-n+1:end)), 10);
end
Note: You are working with Matlab since at least March 2016. You are expected to be able to read the documentation of the cell command.

Kash022

Kash022 (view profile)

on 25 Jan 2019
Thanks Jan for the detailed answers! Yes, I will take care to read the doucmentation in further details.
Kash022

Kash022 (view profile)

on 25 Jan 2019
@Jan what happens if I need leading zeros?
Jan

Jan (view profile)

on 25 Jan 2019
Leading zeros allow a simpler code:
x = 10000111;
n = floor(log10(max(x))); % Here the maximum value matters
out = rem(floor(x(:) ./ power(10, n:-1:0)), 10)

per isakson (view profile)

on 25 Jan 2019
Edited by per isakson

per isakson (view profile)

on 25 Jan 2019

"cell array as shown" The screenshot doesn't show any cell array
Another approach
>> str = sprintf('%d', 10000111 );
>> num = reshape( sscanf( str, '%1d' ), 1,[] )
num =
1 0 0 0 0 1 1 1
>>

Show 1 older comment
per isakson

per isakson (view profile)

on 25 Jan 2019
Easier to type, but it's too much black magic to my taste.
Jan

Jan (view profile)

on 25 Jan 2019
Exploiting the old-fashioned ASCII coding is less magic than calling sprintf, which is a huge library function. In very old Matlab versions, sprintf suffered from a bug, which allowed to gain admin privileges only by using strange format strings.
per isakson

per isakson (view profile)

on 25 Jan 2019
>> '€'+'ab' % undocumented behaviour(?)
ans =
8461 8462
>> "€"+"ab" % documented behaviour
ans =
"€ab"

Walter Roberson (view profile)

on 25 Jan 2019

I do not think you have a cell array at present. I think you have a double array.
OutputCell = arrayfun(@(V) sprintf('%08d', V) - '0'), YourArrayNameGoesHere, 'uniform', 0)

Kash022

Kash022 (view profile)

on 25 Jan 2019
sorry..this doesn't work..it outputs [1,0,1,0,1,0,0,1] which is not what I want...
it should be like [1] [0] [1] [0] [1] [0] [0] [1]
Kash022

Kash022 (view profile)

on 25 Jan 2019
well, it works like this now
my_cell = cell2mat(OutputCell);