Save values in the middle of a loop

Question

Carlos 2014-3-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123245-save-values-in-the-middle-of-a-loop

回答： Marta Salas 2014-3-26

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