Difficulty plotting values from a for loop

Question

Alexander Babayi 2016-10-4

0
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https://ww2.mathworks.cn/matlabcentral/answers/305613-difficulty-plotting-values-from-a-for-loop

评论： Alexander Babayi 2016-10-4

I'm attempting to create a plot from values generated in a for loop, but the values don't seem to be appearing in the plot that MATLAB generates. Here is the code:

for t = -5:1:50;
   if t>=0 && t<=8;
        v = 10.*t.^2 - 5.*t;
   elseif t>8 && t<16;
        v = 624 - 3.*t;
   elseif t>=16 && t<=26;
         v = 36.*t + 12.*(t - 16).^2;
   elseif t>26;
        v = (2136).*exp(-0.1.*(t - 26));
   else
       v = 0;
   end
   plot(t,v,'o');
end

It seems to be only plotting the last point (at t = 50) and none of the previous points, which has led me to believe that every time the file goes through the loop and reaches the line where it is supposed to plot the coordinate pair, it overwrites the previous pair with the current one, and does so until the end, thus leaving me with only the final coordinate point on the plot. I've tried putting "disp(t)" and "disp(v)" in the place of "plot(t,v,'o')", and all the corresponding values appear in the command box, but only the last one ends up being actually plotted. How can I go about changing the code so that it retains each of the "v" values as "t" goes from -5 to 50, and is able to plot the entire domain? Do I perhaps need to change the variables in the line where it plots so that they aren't simply "t" and "v"?