isempty is allways zero

Hello,

im using isempty:

TP =
     0     0     0
>> isempty(TP)
ans =
  logical
   0
   
>> TP(3) = 1
TP =
     0     0     1
>> isempty(TP)
ans =
  logical
   0

Why is locical answer still zero? What can I do? I need to check multiple arrays for empty or not in if-else blocks.

Answer 1

[Fangjun Jiang]

zero and empty are different

isempty([])
isempty(0)
isempty('')

[Nik Rocky]

Okay, and how can i detect a zero values?

For example:

TP =
     0     0     0
>> ismember(TP,0)

ans =
  1×3 logical array

   1   1   1
   
>> TP(3) = 1

TP =

     0     0     1

>> ismember(TP,0)

ans =

  1×3 logical array

   1   1   0

How can I do it for whole array and just get a value for all zeros 1 and for not all zeros 0?

[Fangjun Jiang]

all(), any()

[Nik Rocky]

TP1 =

     0     0     0

>> TP2 = [0 1 0]

TP2 =

     0     1     0

>> any(TP1)

ans =

  logical

   0

>> any(TP2)

ans =

  logical

   1

Right?

[Walter Roberson]

Yes.