Mathc, Calculus Packages, Matrices Packages, Vectors Packages.

In these packages, you can verify the result into GnuPlot.

Calculus Packages :

Chapter 03 : The Derivative.

The tangent : c03a.zip.

* Draw the tangent.
* Animate the tangent.
* Find the intersection points of the tangent with the x-y axis.
* Find the length of the tangent from P to the x axis.
* Find the length of the tangent from P to the y axis.
* Find the length of the under tangent.

The normal : c03b.zip.

* Draw the normal.
* Animate the normal.
* Find the intersection points of the normal with the x-y axis.
* Find the length of the normal from P to the x axis.
* Find the length of the normal from P to the y axis.
* Find the length of the under normal.

Matrices Packages :

mtrxgo.zip : Geometric applications.

* Find the coefficients of a polynome,
that passes through three, four, five points.

* Find the coefficients a, b, c, d, e of a conic,
ax**2 + by**2 + cx + dy + e = 0
that passes through four points.

* Find the coefficients a, b, c, d of a circle,
a(x**2 + y**2) + bx + cy + d = 0
that passes through three points.

Vectors Packages :

vectac01.zip :

* Reflection about the x-axis.
* Reflection about the y-axis.
* Reflection about the line y = x.
* Orthogonal projection on the x-axis.
* Orthogonal projection on the y-axis.

vectad.zip :

* Vector2d (vertical horizontal shift).

vectae01.zip :

* Reflection about the xy-plan.
* Reflection about the xz-plan.
* Reflection about the yz-plan.
* Orthogonal projection on the xy-plan.
* Orthogonal projection on the xz-plan.
* Orthogonal projection on the yz-plan.