Question

I want to use the 2d plot([x1,x2,x3,x1],[y1,y2,y3,y1]) to draw a triangle in my plot image. But how do I define the borders? the Diagram should not start on the motleft point and so forth but for example on the point of origin or any other point I like to use. Also it should end where I want. How to do that?

here the full code:

xs = [0,10,20,0];
ys = [30,50,30,30];
plot(xs,asinh(tan(ys*pi/180)));

the result I wanted:

xs = [0,10,20,0];
ys = [30,50,30,30];
plot(xs,(asinh(tan(ys*pi/180))*180/pi));
xlim([-10 30])
ylim([-10 60])

Answer 1

I’m not sure I understand your question. If you want to set the limits of the axes of your plot so that you can place your triangle anywhere within the plot:

Try xlim([xmin, xmax]) and ylim([ymin, ymax]) after you run the plot command: see http://www.mathworks.com/help/techdoc/ref/xlim.html

If you want to know how to draw a triangle by plotting points and connecting the points:

Try simply ordering x1, x2,x3 etc in the order in which you want to connect the dots and run plot so that it plots lines (which I believe it does by default). But to be explicit you can run plot([x1,x2,x3,x1],[y1,y2,y3,y1],'b-') to make a blue line connecting the points.