Vector Differentiation Quicksheet Question

[astevenson-2]

In the Differentiation and Integration of Data Vectors quicksheet, when the function fit(x) is plotted using the variable f(z) versus z, z hasn't yet been defined. When I duplicated the quicksheet in a blank worksheet, I expected my plot to fail because I hadn't defined z. Wrong. It plotted but not the same range as the quicksheet. What is z in this quicksheet and how do you control it's min, maximum and increment between data points?

[VladimirN]

You talk about quicksheet in what version of Mathcad?

[astevenson-2]

15

[LucMeekes]

If you plot a (any) function of a (any) variable x,t or z (or any other name) that variable gets defined from -10 to 10.

To control its range and step, simply define it yourself.

There's no magic. Consider it a free gift that you can use if you forgot to define the running variable.

This example was done in MathCad 11

Success!
Luc

[astevenson-2]

Thanks Luc. When you don't set up the range variable beforehand, what is the step size? So in your case, before you defined "hoho", what was the step size?

[StuartBruff · Accepted solution]

Andy Stevenson wrote:

Thanks Luc. When you don't set up the range variable beforehand, what is the step size? So in your case, before you defined "hoho", what was the step size?

The Prime 3.1 Help says a Quick Plot has 500 points, so the step size will depend upon what the limits of the plot are.  I'm not sure how many are in a M15 plot, but it is dense:

One other thing to note is that you can change the range of the x axis simply by entering new values (numbers or variables) into the minimum & maximum axis placeholders, as I've done in the above plot; the Plot component will automatically vary x over the new range and with appropriate step size for the number of points - as further shown below.

Stuart