find the last non-zero value

Question

Mahsa 2015-3-27

编辑： Image Analyst 2015-3-27

For a regular vector we can use following command to extract the vector after pre-allocating.

if m = [ 1 2 3 4 5 0 0 0 0 0 0 0 0] 
m(m==0)=[] 
m= [1 2 3 4 5];

However my question is what to do if zero is one of the real values like the following example:

m = [ 1 2 0 3 4 0 5 0 0 0 0 0 0 0 0];

I'm looking for a command that gives me

m = [ 1 2 0 3 4 0 5]

Thank you

Answer 1

Stephen23 2015-3-27

编辑：Stephen23 2015-3-27

Use find to locate non-zero values in an array. The optional arguments help you too:

>> m = [ 1 2 0 3 4 0 5 0 0 0 0 0 0 0 0];
>> m(1:find(m,1,'last'))
ans =
   1     2     0     3     4     0     5