Save values in the middle of a loop

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Hello, I'm coding an infinite loop that will be shooting photos every X minutes. The problem is that I need that it save the rows every time it has one, but the program only save in the workspace when the function has finished (I've put only 3 photos for seeing the result). Is there any way to keep updating every 30minutes in the workspace my matrix?
Thanks. Heres is my code:
function CalculaParticulas
vid = videoinput('winvideo', 1,'I420_1280x720');
set(vid,'ReturnedColorSpace','grayscale');
Densidad=1000;
VolumenMAX=pi*1000/(8E18);
VolumenMIN=pi*15.625/(8E18);
Caudal=0.01; %m3/min
i=1;
pause(2);%Dejamos 32 minutos de margen antes de empezar (en segundos)
while (1);
img{i} = getsnapshot(vid);
fname = ['img' num2str(i)];%que nombre le ponemos al archivo
imwrite(img{i}, fname, 'jpg');%guardar el archivo con formato
pause(2);%paramos 3minutos entre foto y análisis
img{i} = imread(['img' num2str(i)]);
% %imshow(img1)% Si queremos ver la imagen original
img2{i}=im2bw(img{i},graythresh(img{i}));
img2{i}=~img2 {i};
B=bwboundaries(img2 {i});
NumberOfParticle(i)=length(B);
% disp(['Hay ', num2str(NumberOfParticle), ' partículas'])
%hold on
%for k = 1:length(B)
%boundary = B{k};
%plot(boundary(:,2), boundary(:,1), 'g', 'LineWidth', 0.2);
%end
Concentracion(i,1)=NumberOfParticle(i)*VolumenMAX*Densidad/Caudal
Concentracion(i,2)=NumberOfParticle(i)*VolumenMIN*Densidad/Caudal
Concentracion(i,3)=(Concentracion(i,1)+Concentracion(i,2))/2
% assignin('base','Concentracion',Concentracion);
i=i+1;
pause(5); %esperamos 27'
if i==3;
break;
end
end

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Marta Salas
Marta Salas 2014-3-26

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