Conic Sections: Parabola and Focus. example. Conic Sections: Ellipse with Foci
The demo above allows you to enter up to three vectors in the form (x,y,z). Clicking the draw button will then display the vectors on the diagram (the scale of the diagram will automatically adjust to fit the magnitude of the vectors).
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A vector function is a function that takes one or more variables and returns a vector. We’ll spend most of this section looking at vector functions of a single variable as most of the places where vector functions show up here will be vector functions of single variables.
As with circles the component that has the t t will determine the axis that the helix rotates about. For instance,
If this one had a constant in the z z component we would have another circle. However, in this case we don’t have a constant. Instead we’ve got a t t and that will change the curve. However, because the x x and y y component functions are still a circle in parametric equations our curve should have a circular nature to it in some way.
To graph this line all that we need to do is plot the point and then sketch in the parallel vector. In order to get the sketch will assume that the vector is on the line and will start at the point in the line. To sketch in the line all we do this is extend the parallel vector into a line.
Also note that if we allow the coefficients on the sine and cosine for both the circle and helix to be different we will get ellipses.
will be a helix that rotates about the y y -axis and is in the shape of an ellipse.
Note however, that in practice the position vectors are generally not included in the sketch.
A vector function is a function that takes one or more variables and returns a vector. We’ll spend most of this section looking at vector functions of a single variable as most of the places where vector functions show up here will be vector functions of single variables.
As with circles the component that has the t t will determine the axis that the helix rotates about. For instance,
If this one had a constant in the z z component we would have another circle. However, in this case we don’t have a constant. Instead we’ve got a t t and that will change the curve. However, because the x x and y y component functions are still a circle in parametric equations our curve should have a circular nature to it in some way.
To graph this line all that we need to do is plot the point and then sketch in the parallel vector. In order to get the sketch will assume that the vector is on the line and will start at the point in the line. To sketch in the line all we do this is extend the parallel vector into a line.
Also note that if we allow the coefficients on the sine and cosine for both the circle and helix to be different we will get ellipses.
will be a helix that rotates about the y y -axis and is in the shape of an ellipse.
Note however, that in practice the position vectors are generally not included in the sketch.