# KmPlot/Using Sliders

A main feature of **KmPlot** is to visualize the influence of parameters to the curve of a function.

## Moving a Sinus Curve

Let's see, how to move a sinus curve left and right:

- Create a new Cartesian plot.
- Enter the equation
f(x,a) = sin(x-a)

- Check the option and choose from the drop down list.
- To make the available sliders visible, check

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

- Image:Kmplot function with param.png
Input

- Image:Kmplot view show sliders.png
Show sliders option

- Image:Kmplot sliders.png
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 option and choose from the drop down list.
- To make the available sliders visible, check

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

This page was last edited on 11 October 2010, at 18:08. Content is available under Creative Commons License SA 4.0 unless otherwise noted.