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how to shift an array value upward ?

Asked by preet on 2 Apr 2013

a=[10,14,5,6,7,19]

in this array need to build an array a[] again but the value should not be less than or equal to 15 i need it

a=[24,18,19]

when i shift the value after adding my value which i have already added remain in the array like this

in 1st loop i have result lke this

a=[24,5,6,7,19,19]

how to get the right result with shifting

4 Comments

preet on 2 Apr 2013

ok i have an array a[10,14,5,6,19] i add the value which less then 15 or equal to and shift one position upward to the the remain value of array a[]. i got this array after 1st loop a=[24,5,6,7,19,19]

which value shift upward also occupy the same position and going to one position upward. i need to avoid the last position which also going to upward .

but i require a=[24,5,6,7,19]

Azzi Abdelmalek on 2 Apr 2013

you added a value to what?

preet on 2 Apr 2013

i m adding value with array itself if the current value of array is less or equal to 15.

preet

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2 Answers

Answer by Mahdi on 2 Apr 2013
Accepted answer

Just use

a=a(1:end-1)

to remove the last value.

0 Comments

Mahdi
Answer by Jan Simon on 2 Apr 2013
a  = [10, 14, 5, 6, 7, 19];
r  = zeros(size(a));  % Pre-allocate maximal length
ri = 0;
q  = 0;
for k = 1:length(a)
  q = q + a(k);       % Accumulate values of "a"
  if q >= 15          % Flush accumulated value:
    ri    = ri + 1;
    r(ri) = q;
    q     = 0;
  end
end
r = r(1:ri);          % Crop unused values

2 Comments

preet on 2 Apr 2013

simon i want to a[ ] array again not r [].

Jan Simon on 2 Apr 2013

@kpreet: Is this a serious question? What about adding this line at the end:

a = r;

Or you can do it "inplace", but the modifications are such tiny (changing all "r" to "a" and "ri" to "ai"), that I'd actually assume, that you could solve this by your own:

a  = [10, 14, 5, 6, 7, 19];
ai = 0;
q  = 0;
for k = 1:length(a)
  q = q + a(k);       % Accumulate values of "a"
  if q >= 15          % Flush accumulated value:
    ai    = ai + 1;
    a(ai) = q;
    q     = 0;
  end
end
a = a(1:ai);          % Crop unused values

It would be a kind idea to explain, if at least the values of "r" match your expectations.

Jan Simon

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