Plotting > Basics

The versions of Math Processor prior to** v.1.0.1.2** had very limited plotting capabiliites. There was only one function available by the name of plot. That function did not provided any facilities to work with plots at a lower level.

Math Processor **v.1.0.1.2**, however, introduced several new functions, which make it very easy to work with plots at a pretty detailed level. Now it is possible to rotate, scale or combine plots in a very flexible manner. In this tutorial, I will show how to use the new plotting routines.

First thing is to create a plot, which is as easy as calling the createplot() function:

>> p = createplot()

Now we have a "Plot" object named 'p' and we can use this object to display our plot. But we first need to add data to it. Let's add a single plot to this object. Paste this line (without the '>>' signs) into MP and hit enter:

>> x = vectorin(-2*pi, 0.005, 2*pi);

The semicolon at the end of the line tells MP to hide the resulting data. Remove the terminating semicolon (;) to see what values were generated. The vectorin() function has created an array of values between -2*pi and 2*pi using a step value of 0.005. Now let's add a sine curves to our plot **'p'**:

>> addplot(p, x, sin(x))

That was simple! Now we have a plot object with some plot data added to it. Let's view out plot:

>> showplot(p)

hmmm.. Something is not right. All we see is a tiny tiny plot at the middle of screen. We want to view it closely. Let's zoom in:

>> showplot(p, 40, 40)

Cool! Yep now we can see our sine curve! Let's add more data to the plot:

>> addplot(p, x, cos(x), 90, 2, red)

>> showplot(p, 40, 40)

>> showplot(p, 45, 30, 30)

The last line is rotating the whole plot (and not the individual curves) by 45 degrees. We want to remove the first curve:

>> removeplot(p, 0)

>> showplot(p, 40, 40)

I hope you enjoyed the tutorial. For further details, refer to the documentation on plotting.