+ + + =

plot2D 制图2D

x=, y =
y = 0, x =

The plot2D() can plot funtion, equation, derivative, integral, polar plot, parametric plot, animation. The independent variable must be typed as x for evaluation. The time variable must be typed as t. The implicit line plot of a function of two variables over ranges. Complex calculation must be converted to complex operator by tocomplex() before calculation and plot.

For example :

1. for contour lines, put your expression into the sin( ) function, e.g. put x*x-y*y-1-t into sin( ), sin(x*x-y*y-1-t), click the band checkbox
2. for implicit function of x and y, sin(x-t)-y
   
3. for equation, input sin(x-t)-cos(y)=0 or sin(x-t)-cos(y)
   
4. for derivative of sin(x), tick the dy/dx: checkbox, or input ds(x=>sin(x),x)
   
5. for second order derivative of sin(x), input ds(x=>sin(x),x,2)
   
6. for the 0.5 order derivative = semi derivative, input ds(x=>sin(x),x,0.5)
   
7. for the -0.5 order derivative = semi integral, input ds(x=>sin(x),x,-0.5)
   
8. for polar plot x from the -Axis to Axis value, tick the polar: checkbox.
   
9. for polar plot x from 0 to the Axis value, tick the x>0: checkbox.
   
10. for parametric plot, input sin(x-t),cos(x)
    
11. for animation, input sin(x), then tick the auto Axis: button; or add the time t variable, input sin(x-t), then click the auto t: checkbox; or add the timer(t) function and change animation speed by the different t value, input sin(x-timer(t))

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• Example :