MATLAB: Time axes (horizontal axes) range of Scope

rangescopetime

I set simulation time on 5000s but after stopping simulation, Scope displays from 4995s to 5000s and not from 0 to 5000. what's the problem?

Best Answer

By default, the Scope block has a limit of 5000 data points. Change the Scope parameters in the "Data History" tab to allow more data points.

However, if your simulation from 4995s to 5000s takes 5000 data points, you may have too many data points. You don't need that many data points to show in the scope. You won't be able to tell it anyway. Change the sampling decimation from 1 to 10 or even 100, 1000 to reduce the data pints but still give you a big picture of the curve.

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MATLAB: The scope axis changes

You need to un-check the option Limit Data Point to last

See the picture above.

Hope that helps,

ILham

MATLAB: Plot arrow in polarplot() (not cartesian axes)

I ended up using method 1 in the question (1. simulate an arrow by calculating and drawing an arrow shape from lots of little lines using the polarplot() function). It seems to work alright, I'm sure there must be better methods. Posting code for others

polar plot arrow

    %%%Data %%%%
    resultant_direction = rand(1)*2*pi;
    resultant_length = 0.5 + (1-0.5).*rand(1);
    %%%%arrow head %%%%
    arrowhead_length    = resultant_length/15; % arrow head length relative to resultant_length
    num_arrowlines = 100;
    arrowhead_angle = deg2rad(30); % degrees
    %%%%arrow tip coordinates %%%%
    t1 = repmat(resultant_direction,1,num_arrowlines);
    r1 = repmat(resultant_length,1,num_arrowlines);
    %%%%arrow base coordinates %%%%
    b = arrowhead_length.*tan(linspace(0,arrowhead_angle,num_arrowlines/2));
    theta = atan(b./(resultant_length-arrowhead_length));
    pre_t2 = [theta, -theta];
    r2 = (resultant_length-arrowhead_length)./cos(pre_t2);
    t2 = t1(1)+pre_t2;
    %%%%plot %%%%
    figure(1)
    polarplot([t1(1) t1(1)],[0 r1(1)-0.9*arrowhead_length],'r','linewidth',3)
    hold on
    polarplot([t1; t2],[r1; r2],'r')

Best Answer

Related Solutions

MATLAB: The scope axis changes

MATLAB: Plot arrow in polarplot() (not cartesian axes)

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