Using multiple functions in cellfun

I want to clean up a nasty for loop. Here is the loop I'm trying to remove.

    for j=1:line_num
        bin_str = dec2bin(hex2dec(HEX_DATA{j,1}));
        OUT.1{j, 1}  = bin2dec(bin_str(1:(end-11)));
        OUT.2{j, 1}  = bin2dec(bin_str((end-9):(end-5)));
        OUT.3{j, 1}  = bin2dec(bin_str((end-4):end));
        if strcmp(bin_str(end-10), '1')
            OUT.4{j, 1} = 'T';
        else
            OUT.5{j, 1} = 'R';
        end
     end

I have a cell array (HEX_DATA) containing hex strings. I want to use cellfun to convert all from hex to binary. I need some help with how to compose the command. This is what I've tried so far. Is this possible?

BIN_DATA = cellfun(@x dec2bin(hex2dec(x),8), HEX_DATA);
Error: Unexpected MATLAB expression.

Is there a way for me to use cellfun to pull specifing parts of the binary string, perform a bin2dec, and output them into separate cell arrays? Would it be something like:

OUT.1 = cellfun(@bin2dec, BIN_DATA{:,1}(1:(end-11)));

Cheers, Mike

[Azzi Abdelmalek]

do you mean

OUT= cellfun(@bin2dec, BIN_DATA)

Answer 1

[Azzi Abdelmalek]

HEX_DATA={'0ff';'0f0';'00f'}
BIN_DATA = cellfun(@(x) dec2bin(hex2dec(x),8), HEX_DATA,'un',0)

[Mike K]

Azzi,

K>> HEX_DATA = {'0ff';'0f0';'00f'};
K>> BIN2 = cellfun(@x dec2bin(hex2dec(x),8), HEX_DATA,'un',0);
 BIN2 = cellfun(@x dec2bin(hex2dec(x),8), HEX_DATA,'un',0);
                  |
Error: Unexpected MATLAB expression.

[Azzi Abdelmalek]

Mike copy and paste my code

its not @x it's @(x)

[Mike K]

Looks like reading isn't my strong suit...I copy pasted and it worked like a champ! Thanks Azzi! Do you have any input on how to do the second part of my question?

[Azzi Abdelmalek]

do you mean

 OUT= cellfun(@bin2dec, BIN_DATA);

Answer 2

[Jan]

The FOR loop is not nasty. dec2bin and bin2dec are very inefficient as well as hex2dec is. For the later sscanf(Str, '%x') is usually much faster.

"OUT.1" is no valid Matlab symbol, because fieldnames cannot start with a number.

Is "Out" pre-allocated? Otherwise it grows in each iteration and this wastes a lot of time.

Instead of converting the decimal value to a bit-string, the function bitget can obtain the different bits much faster directly from the decimal value:

StrPool = 'TR';
OUT = cell{line_num, 1);
for j=1:line_num
  value = sscanf(HEX_DATA{j}, '%x');
  S.field1 = bitget(value, 31:-1:11);  % No idea which bits you want!
  ...
  S.field4 = StrPool(bitget(value, 11) + 1);
  OUT{j} = S;
end

This is not working, but only a code example.