Help with how to exclude zero and show a more efficient way to display the velocity and time in one line?

Question

Jason 2014-11-4

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评论： Star Strider 2014-11-4

veldata.txt

I cant figure out how to exclude zero so that when the min velocity and the time the min velocity occurs to not show zero basically I want to show the first velocity and time thats not zero and to display the velocity and time together in a more efficient way??
clear;
  clc;
veldata = dlmread('veldata.txt',' ');
time = veldata(:,1);
velocity = veldata(:,2);
if (time > 0)
    time = time;
end 
[min_velocity,min_ind] = min(velocity);
[max_velocity,max_ind] = max(velocity);
avg_velocity = mean(velocity);
t_minv = time(min_ind);
t_maxv = time(max_ind);
disp('The min velocity at time = ')
disp(min_velocity)
disp(t_minv)
disp(' The max velocity at time in seconds is = ')
disp(max_velocity)
disp(t_maxv)
disp('The average velocity is: ')
disp(avg_velocity)

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Answer 1

Star Strider 2014-11-4

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Change the first few lines of your code to these:

veldata = dlmread('veldata.txt',' ');
timev = veldata(:,1);               % Changed ‘time’ To ‘timev’
velocityv = veldata(:,2);           % Changed ‘velocity’ To ‘velocityv’
% ADD THESE LINES
time = timev(timev>0);
velocity = velocityv(velocityv>0);

The rest of your code is unchanged.

I kept the original data for ‘velocity’ as ‘velocityv’ and ‘time’ as ‘timev’ in the event you want them intact for later processing or plotting.

The definition of ‘time’ and ‘velocity’ from them uses ‘logical indexing’. (It would otherwise require the find function to do the same thing.)

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Jason 2014-11-4

在 MATLAB Online 中打开

Thank you so much! By the way do you happen to know how I can display the velocity and time in one statement instead of two right now it looks like this in the command window

The min velocity at time = 
   12.4000
      0.4000
   The max velocity at time in seconds is = 
      22
      2.8000
The average velocity is: 
   18.4000

Star Strider 2014-11-4

在 MATLAB Online 中打开

Yes!

Use the fprintf function:

fprintf(1,'\nThe min velocity at time = %.2f is %.2f\n', t_minv, min_velocity)
fprintf(1,'\nThe max velocity at time = %.2f is %.2f\n', t_maxv, max_velocity)
fprintf(1,'\nThe average velocity is %.2f\n', avg_velocity)

(The ‘1’ file identifiers denoting standard output — the Command Window — aren’t strictly necessary now, but they once were and I’m in the habit of using them.)

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Answer 2

Image Analyst 2014-11-4

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You forgot to attach veldata.txt. You can set graphing limits with the xlim() and ylim() functions. Set them up to not include 0 if you don't want 0 on your axes. If that doesn't do it, then attach your data so we can see what you're talking about. http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer