Octave instructions

  Free math software , Very powerful , and matlab be similar , Do you want to learn first , Later, you can use this software to deal with point clouds .

>> clear
>> t=[0:0.01:0.98];
>> y1 = sin(2*pi*4*t);
>> plot(t,y1);
>>

 % hold on function The function of will The new image is drawn in Above the old >> plot(t, y2, 'r'); %r For red >> xlabel('time') % Mark X The axis is the horizontal axis >> ylabel('value') >> legend('sin', 'cos') % With this order legend('sin', 'cos') Put this The legend is on the top right Represent the content represented by these two curves >> title('my plot')>> print -dpng 'myplot.png' % Output

Just learned , Continuous updating