update values in a for loop except one

Question

Marco Carapellese 2022-2-22

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评论： Marco Carapellese 2022-2-22

hi everyone, i have the following problem. I have a simulation seconds ranging from 0 to 630 seconds, at which every 90 I would like to perform actions.

now here I would like to obtain a newgreentime that every in every value of t (v) updates according to a function of this type, in practice that takes into consideration one column at a time of the veicoliTT (n, v) to be subtracted from the greentime calculated in the t(v) previous. as soon as I got this value I would like to use it to set it to yet another function. This whole operation should be computed for every v, except for greentime with v = 1, for which I would like to take a constant value outside the for loop instead with the values 45,45,45,45 (while the veicoliTT (n, v) for v = 1 must be equally calculated by the for loop). how can i do this?

L is constant matrix 4x34

Thank you so much

SIM_STEPS = [1 630];

beginTime = SIM_STEPS(1);

duration = SIM_STEPS(2);

endTime = SIM_STEPS(1) + SIM_STEPS(2) - 1;

k=1:floor(endTime/T); %is a vector ranging from 1 to 7

t = T:T:duration; % returns the values 90,180 ... 630

inductionID=traci.inductionloop.getIDList(); % function that creates me a vector of 34 values

T=90;

greentime=[45 45 45 45]'; %I would like it to be the value of newgreentime for v = 1

for i = 1:duration

traci.simulation.step();

for n = 1: length(inductionID)

num(n,i)=traci.inductionloop.getLastStepVehicleNumber(inductionID{n});

% creates a 34x630 vector

end

for v=1:length(k)

if i==t(v)

for n = 1: length(inductionID)

veicoliTT(n,v)=sum(num(n,(t(v)-(T-1)):t(v)));% I create a sum vector of 90 elements for each value of v

newgreentime(v)=newgreentime(v-1)-L*veicoliTT(:,v); % don't work

end

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Answer 1

Benjamin Thompson 2022-2-22

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Not understanding what you are trying to do exactly. But one way to test that a counter has reached some multiple of an integer T is to use the modulus function:

if mod(i, T) == 0

for n = 1: length(inductionID)

veicoliTT(n,v)=sum(num(n,(t(v)-(T-1)):t(v)));% I create a sum vector of 90 elements for each value of v

newgreentime(v)=greentime(v)-L*veicoliTT(:,v); % don't work

end

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Marco Carapellese 2022-2-22

hello, thanks for the answer. I had no problem with dividing into 90s intervals as

for v = 1: length (k) and if i == t (v) works. My problem is that within these cycles I would like to calculate (I tried but that part doesn't work) that newgreentime as a negreentime of the previous period -less veicoliTT (considering only the column of it that concerns the v iterate at that moment). I would like to repeat this operation for each v present in the for loop in order to obtain as many newgreentime vectors as there are v. Another exception, however, is that the newgreentime calculated in v = 1 must not follow that function but must be exactly equal to the greentime value abroad of all the cycles and therefore to a constant

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Answer 2

David Hill 2022-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/1656110-update-values-in-a-for-loop-except-one#answer_902260

编辑：David Hill 2022-2-22

在 MATLAB Online 中打开

If you really want seconds... you might want to use clock and etime. I don't entirely understand what you want. For example something like this:

stime=clock;
itime=stime;
v=0;
count=1;
while etime(stime,clock)*1000<630
    traci.simulation.step();
    for n = 1: length(inductionID)           
            num(n,count)=traci.inductionloop.getLastStepVehicleNumber(inductionID{n});       
%             creates a 34x630 vector
    end
    count=count+1;
    if etime(itime,clock)*1000>90
        itime=clock;
        v=v+1;
        for n = 1: length(inductionID)
            veicoliTT(n,v)=sum(num(n,(t(v)-(T-1)):t(v)));% I create a sum vector of 90 elements for each value of v
            newgreentime(v)=greentime(v)-L*veicoliTT(:,v); % don't work
        end
    end
end