FREQTABLE

Frequency table.

Description

FREQTABLE Frequency table.
  [Y,N] = FREQTABLE(X) takes a vector X and returns the unique values of
  X in theoutput Y, and the number of instances of each value in the
  output N. X can be a charachter array or cell array of strings.

• Acknowledgements: This submission has inspired the following:; Rankings
• MATLAB release: MATLAB 7 (R14)

[urs (us) schwarz]

no need to use unique. for large Xs this else-code becomes faster for obvious reasons. note histc is a mexed function.

x=sort(xx(:)); % same conditioning
d=diff(x); % same conditioning
% else code
xb=x([find(d);length(x)]);
x=histc(x,xb);
table=[xb x];
just a thought, us

[Mukhtar Ullah]

Thanks us! I have rewritten the file according to your suggestions. Your idea is really clever.

[Bruno Desart]

Just one question: how to use this with cell array?
Many thanks in advance.

[Mukhtar Ullah]

Bruno Desart,
In fact, you have pointed out a limitation:
this file can't be used for cell arrays; for cells use tabulate(statistic toolbox)

[Mukhtar Ullah]

This function now supports character arrays and cell arrays of strings.

[Celia Sobrino]

very smart

[meinhard ploner GMX]

i changed the code line after "S=..." to:

    B = S([ 1 1+find(diff(S)) ]);

and now it works for me, too. Without the change i got the message: ??? Error using ==> vertcat
CAT arguments dimensions are not consistent.

[meinhard ploner]

ok, i had a transposed vector in the last try(see last review). surely [1; 1+find(diff(S))] instead of [find(diff(S)); end] does not change anything in terms of performance ;-))