Azzera filtri
Azzera filtri

check whether a number belongs to an array or not

1.283 visualizzazioni (ultimi 30 giorni)
hi all, i want to check a number in the array.i have created an array and i want to know that a whether a perticular number belongs to the array or not. is there any inbuild function for "belongs to" in matlab. can anybody help me?

Risposta accettata

Walter Roberson
Walter Roberson il 28 Dic 2011
ismember()
Note: if you are not using purely whole numbers, then please read http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
  5 Commenti
Walter Roberson
Walter Roberson il 30 Mar 2018
Note: later versions of MATLAB added ismembertol() for dealing with floating point numbers.

Accedi per commentare.

Più risposte (1)

Jan
Jan il 28 Dic 2011
A = floor(rand(100, 100) * 1000);
contains5 = any(A(:) == 5);
If the array is large and the searched element is found early, Matlab wastes a lot of time by searching the rest of the array. Then this C-Mex is faster: FEX: anyEq.
  4 Commenti
ha ha
ha ha il 30 Mar 2018
@Jan. Can you teach me how to run FEX: anyEq. as you mentioned? Thanks
James Tursa
James Tursa il 30 Mar 2018
- Download the code from the provided link
- Compile the code at the command line:
mex anyEq.c -largeArrayDims
- Use the function like any other function. For help on syntax,
help anyEq

Accedi per commentare.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by