KmPlot/Using Sliders/fr

Une fonctionnalité principale de KmPlot est de visualiser l'influence des paramètres d'une fonction sur une courbe.

Bouger une courbe de sinus

Regardons comment déplacer une courbe de sinus de gauche à droite :

• Create a new Cartesian plot.
• Enter the equation

  f(x,a) = sin(x-a)

• Check the Slider option and choose Slider No. 1 from the drop down list.
• To make the available sliders visible, check View -> Show Sliders

Now you can move the slider and see how the parameter value modifies the position of the curve.

• Screenshots
• 
  Input
• 
  Show sliders option
• 
  Slider window

Trajectory of a Projectile

Now let's have a look at the maximum distance of a projectile thrown with different angles. We use a parametric plot depending on an additional parameter which is the angle.

• Define a constant v_0 for the starting velocity.
• Create a new parametric plot
• Enter the equations

  f_x(t,α) = v_0∙cos(α)∙t
  f_y(t,α) = 2+v_0∙sin(α)∙t−5∙t^2

• Check the Slider option and choose Slider No. 1 from the drop down list.
• To make the available sliders visible, check View -> Show Sliders

Now you can move the slider and see how the distance depends on the parameter value.