CODEWITHSUNDEEP
scilab
Akanzar
Akanzar

Reputation: 11

SCILAB-animation, scale constantly changing

 F=zeros(3,3);
F(1,:)=[0.3,0.35,0.2];
T=diag([0.2,0.5],-1);
P=(F+T)
X=[100;100;57]


    plot2d([1,2,3],X)
    for i=1:100
            drawlater();
            X=P*X;
            clf;
            plot2d([1,2,3],X)
            drawnow();
        end

scilab is constantly rescaling my animation. How to avoid rescaling ? Thanks in advance!

Upvotes: 0

Views: 239

Answers (3)

Stéphane Mottelet
Stéphane Mottelet

Reputation: 3014

I would suggest this way of doing the animation, i.e. by using the data field of Polyline entity:

clf
plot2d([1,2,3],X)
h = gce().children
gca().data_bounds(3:4)=[1e-30,100];
gca().log_flags="nln"

for i=1:100
    X=P*X;
    h.data(:,2) = X;
    sleep(100)
end

Without the sleep(100) the animation is too fast...

Upvotes: 0

GerdF
GerdF

Reputation: 11

In addition to set the "data_bounds" as it was already given in another answer, you might have to set "tight_limits" to "on".

If tight_limits is "off", then the axis limits are not necessarily set to the values specified by data_bounds but may be set to a slightly larger range in order to achieve pretty tic labels.

Upvotes: 1

luispauloml
luispauloml

Reputation: 1010

Every time you call clf(), current figure is cleared, therefore, there are no data boundaries set when plot2d() is called. So for every pair clf() plot() new boundaries are set, and the graph is re-scaled.

If you need the figure to be clear, and fixed boundaries, you have to set that axes property data_bound using set() in each loop:

set(gca(), 'data_bound', [x_min, y_min; x_max, y_max]);

I noticed your animation goes from 1 to 3 in X, and from 0 to 100 in Y, so you could write your loop like this:

plot2d([1,2,3],X)
for i=1:100
    drawlater();
    X=P*X;
    clf();
    plot2d([1,2,3],X)
    set(gca(), 'data_bounds', [1, 0; 3 100]);
    drawnow();
end

I also noticed the result is not good, but that's a problem with the data you're generating and the fixed scale you want, and not the animation "technique" itself.

Upvotes: 0

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