How to save a variable length vector iterating in a loop into an Array

Hi,

I was trying to do some detection using the code below

    % generate total area
    zone_dev=zeros(ndev);
    area_zone=ndev/100;
    % dev_zone=reshape(dev_num,[],area_zone);
    % depth_dev_zone=reshape(depth,[],area_zone);
    zone=1;
    while(zone<=(ndev/100))
        %     cood_zone(1,zone)=round(mean(dev_zone(:,zone)))+10*randi(zone)
        found=dev(dev<zone*100 & dev>(zone-1)*100))'
        %     if zone==0  
        %         zone_dev_zone=[found]
        %     else
        %         zone_dev_zone=[zone_dev_zone,found]
        %     end
        zone=zone+1;
    end
    Msr

However, as the variable found is a column vector of random size, found is overridden with the current loop values.

Can someone guide me further in saving these values into an Array/List/Table.

Thanks in Advance :)

Ayan

Answer 1

[Geoff Hayes]

Ayan - if you want to save your found elements into an array, just initialize an array (before the while loop) to something that is sized appropriately. In your case, since you iterate from one to ndev/100, you will want to create a cell array with ndev/100 elements as

 foundData = cell(ndev/100, 1);
 zone = 1;
 while(zone<=(ndev/100))
     foundData{zone} = dev(dev<zone*100 & dev>(zone-1)*100))';
     zone = zone + 1;
     % etc.
 end

By the way, you could probably use a for loop instead of a while loop since (in this case) both would be doing the same thing

 for zone = 1:ndev/100
     foundData{zone} = dev(dev<zone*100 & dev>(zone-1)*100))';
 end

and you can then avoid using the zone = zone + 1 to increment zone since the for loop would handle this automatically for you.

[Ayyangar Narasimha]

Hi Geoff, I was trying to achive something similar, Can't think of a way to make it simpler, any help is appreciated.

if true
  % % 
%
%generate total area
zone_dev=zeros(ndev);
area_zone=ndev/100;
dev_zone=reshape(dev_num,[],area_zone);
depth_dev_zone=reshape(depth,[],area_zone);
zone=1;
while(zone<=(ndev/100))
   switch zone
      case 1
          found_1=(dev(dev<=zone*100 & dev>(zone-1)*100))
          [ln_1,nl_1]=intersect(dev,found_1)
          dev_1=sort(nonzeros(nl_1))
          if intersect(Msr,dev_1)==Msr
              Msr_zone=zone
          end
      case 2
          found_2=(dev(dev<=zone*100 & dev>(zone-1)*100))
          [ln_2,nl_2]=intersect(dev,found_2)
          dev_2=sort(nonzeros(nl_2))
          if intersect(Msr,dev_2)==Msr
              Msr_zone=zone
          end
      case 3
          found_3=(dev(dev<=zone*100 & dev>(zone-1)*100))
          [ln_3,nl_3]=intersect(dev,found_3)
          dev_3=sort(nonzeros(nl_3))
          if intersect(Msr,dev_3)==Msr
              Msr_zone=zone
          end
      case 4
          found_4=(dev(dev<=zone*100 & dev>(zone-1)*100))
          [ln_4,nl_4]=intersect(dev,found_4)
          dev_4=sort(nonzeros(nl_4))
          if intersect(Msr,dev_4)==Msr
              Msr_zone=zone
          end
      case 5
          found_5=(dev(dev<=zone*100 & dev>(zone-1)*100))
          [ln_5,nl_5]=intersect(dev,found_5)
          dev_5=sort(nonzeros(nl_5))
          if intersect(Msr,dev_5)==Msr
              Msr_zone=zone
          end
          found_ol=found

    end
    zone=zone+1
end
Msr

end

Thanks ..:)

Ayan