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Store some data from one variable to another variable according to a condition

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Angela Marino 2020-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/557833-store-some-data-from-one-variable-to-another-variable-according-to-a-condition

关闭： MATLAB Answer Bot 2021-8-20

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Hi everyone, I have a little problem.

I have defined these two variables

vel(i,j) (exemple vel=[1 2 3 0 0 0 0 2 1 3 etc])
dist(i,j)
%i,j>>27
pos=ones(27,1)

I would like to store the given "dist" (i,1) corresponding "vel" == 0 only for the first value ==0

if vel(i,1)==0 && vel(i-1,1)~=0
        pos(:,1)=dist(i,1);
end

Is the code correct to have what I want?

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Angela Marino 2020-7-1

编辑：dpb 2020-7-1

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This is the original code

for c=1:num_simulazioni
    %random value generation
    simulazione=rand();
    
    %condition for choosing the sumo file
    if simulazione < 0.5
        system(['sumo -c' 'C:\Users\angel\Desktop\prova_flussi\simulazione_57\r2_traci_57.sumocfg &']);
    else 
        system(['sumo -c' 'C:\Users\angel\Desktop\prova_flussi\simulazione_79\r2_traci_79.sumocfg &']);
    end
  [traciVersion, sumoVersion]= traci.init(8873);
  simulazione=round(simulazione);
  %Variable definitions
  veicoli_controllati={'R2.0'; 'R2.1';'R2.2';'R2.3'};
  tempo_simulazione=7200;
  %initialization of variables for machine learning
  veloc_ML=zeros(27,length(veicoli_controllati));
  pers_ML=zeros(27,length(veicoli_controllati));
  check_point=zeros(28,length(veicoli_controllati));
  %stopped positions R2 bus
  pos_fermateR2=ones(28,1);
  f=1;
  %for loop for calculating values
  for i = 1:tempo_simulazione
    traci.simulationStep();
    %I read vehicles on the net
    VEHID=traci.vehicle.getIDList();
    for j=1:length(veicoli_controllati)
      %I read the information relating to the vehicle investigated
      if ismember(veicoli_controllati{j},VEHID)==1
        pos=traci.vehicle.getPosition(veicoli_controllati{j});                    %position bus
        Xpos(i,j)=pos(1);
        Ypos(i,j)=pos(2);
        num_persone(i,j)=traci.vehicle.getPersonNumber(veicoli_controllati{j});   %capacity bus
        veloc(i,j)=traci.vehicle.getSpeed(veicoli_controllati{j});                %velocity bus
        distanza(i,j)=traci.vehicle.getDistance(veicoli_controllati{j});          %curvilinear abscissa
        %conversion x,y in lat,long
        [lon(i,j), lat(i,j)]=traci.simulation.convertGeo(Xpos(i,j),Ypos(i,j));
      else 
        Xpos(i,j)=NaN;
        Ypos(i,j)=NaN;
        num_persone(i,j)=NaN;
        veloc(i,j)=NaN;
        distanza(i,j)=NaN;
        lat(i,j)=NaN;
        lon(i,j)=NaN;
      end
      %%
      %I identify the position of stops R2 and update the array
      if veloc(i,1)==0 & veloc(i-1,1)~=0 
        pos_fermateR2(:,1)==distanza(i,1);
      end
    end  % loop j
    %internal if loop to understand which stops are between
    if f==pos_fermateR2
      check_point(f,j)=i;
      if f>1
        veloc_ML(m,j)=mean(veloc(check_point(f-1,j):check_point(f,j),j));
        pers_ML(m,j)=mean(num_persone(check_point(f-1,j):check_point(f,j),j));
        %m is the interval between two stops. Value n_stop-1
      end
    end
  end  % loop i
end

MaryD 2020-7-1

在 MATLAB Online 中打开

This not looks like it's going to work as you want only first value.

[index]=find(vel(:,1)==0,'first');
pos(:,1)=dist(index,1);

Try something like this instead

dpb 2020-7-1

在 MATLAB Online 中打开

I fixed indenting to be able to at least see where the loops start/end but no real idea what is trying to be done...

      ...
      %I identify the position of stops R2 and update the array
      if veloc(i,1)==0 & veloc(i-1,1)~=0 
        pos_fermateR2(:,1)==distanza(i,1);
      end
    end  % loop j

is inside the inner loop on both i and j so there's the question of what you're looking for and what subscripts mean...guessing, it looks like maybe i is over some time step and j some data set...but that's purely guessing.

veloc(i,1) and veloc(i-1,1) are each only addressing a single element in an array; and it looks like the (i,j) position is being set inside the loop.

I'm guessing you really want to move this to be after the j loop completes and then look over the i vector of veloc(i,:)

If that were correct, use something like

     ixstop=find(veloc(i,:)==0,1);
     pos_fermateR2(i)==distanza(i,ixstop);

But, this is really guessing about what the code really does...

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