MATLAB: Vectorisation of a loop

vectorization

Is it possible to vectorise this loop? Any help would be greatly appreciated.

% Calculate X(k)
for k = 1:length(T)
X(k) = (sum(Vx(1:k-1).*diff(T(1:k))))+ X1; 
end
% Calculate Y(k)
for k = 1:length(T)
Y(k) = (sum(Vy(1:k-1).*diff(T(1:k))))+ Y1;     
end

Best Answer

X = X1+[0;cumsum(Vx(1:end-1).*diff(T))]
Y = Y1+[0;cumsum(Vy(1:end-1).*diff(T))]

Related Solutions

MATLAB: Easy Question, update scatter point in loop

What if you try this:

x1{1} = [.2; .3]; x2{1} = [.3; .4]; x3{1} = [.5; .6]; x4{1} = [.6; .7]; k = 1;
figure
for k = 1:1:50
hold all
    scatter(x1{k}(1,1), x1{k}(2,1))
      scatter(x2{k}(1,1), x2{k}(2,1));
      scatter(x3{k}(1,1), x3{k}(2,1));
      scatter(x4{k}(1,1), x4{k}(2,1));
      x1{k+1} = (x1{k} + x2{k} + x4{k})/3;
      x2{k+1} = (x1{k} + x2{k} + x3{k})/3;
      x3{k+1} = (x2{k} + x3{k} + x4{k})/3;
      x4{k+1} = (x1{k} + x3{k} + x4{k})/3;
  hold off
  drawnow
  end

First you create a figure, then you force the plot to update with drawnow. You can keep the original "hold on" calls and see what it does as well.

MATLAB: Am trying to plot (x1,t) for the start however am getting an error, i need help with this i have been editing the code for the past two days.

You have

while x1(k) >= 0
 ...
 k = k + 1;
 ...
end

Suppose that none of the x1 values happen to be negative, then because you always increment k you are going to eventually run off the end of the array.

Best Answer

Related Solutions

MATLAB: Easy Question, update scatter point in loop

MATLAB: Am trying to plot (x1,t) for the start however am getting an error, i need help with this i have been editing the code for the past two days.

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