## 173 Reputation

13 years, 329 days

## sumplot, another way...

sumplot.mw

Another way: there is a procedure which I just quote from the "Maple Advanced Programming Guide" (for maple14, page:261) may help you to plot the progress of the two snails.

## rotate...

I use rotate command to plot the vertical line, Something like this:

> sine := plot(sin(x), x = -2*Pi .. 2*Pi, color = blue);
> line1 := plot(Pi, x = -2*Pi .. 2*Pi, color = green);
> line := plottools:-rotate(line1, (1/2)*Pi, [Pi, Pi]);
> plots:-display(sine, line);

## pseudo...

Use the third row to minus the last row will generate the first row, so A is a singular matrix.

Try to add an argument: method=pseudo, namely, moore-penrose pseudo-inverse.

MatrixInverse(A, method = pseudo)

## A maplesoft blog...

Here is a maplesoft blog (Gem 4) may help you understand the problem.

Best regards.

## seq...

I use the following command:

seq(diff(f[i](x), x) = k[i]*f[i](x), i = 1 .. 4)

It returns:

diff(f[1](x), x) = k[1]*f[1](x), diff(f[2](x), x) = k[2]*f[2](x), diff(f[3](x), x) = k[3]*f[3](x), diff(f[4](x), x) = k[4]*f[4](x)

Is this it?

## save pages as pdf format...

I just add a supplementary, I think Mr. hirnyk's answer is appropriate, the information of mapleprimes is too large. And Mr. Christopher2222 's method is very convenient. The following  is another one to save some helpful pages as pdf format.

The appendant is a pdf file generated by this method.1.pdf

## yes, it may be negative...

@Oliver K Thank you very much! I upload the derivation, actually, for some t, the polar radius may be negative. But is there any way to plot a circle which locats in (0.6,0) and its radius is sqrt(0.05) only use polarplot comand?

After reading the help document just a few minutes ago, I find an argument named axiscoordinates = polar may be helpful:

plot([.6+sqrt(0.5e-1)*cos(t), sqrt(0.5e-1)*sin(t), t = 0 .. 2*Pi], axiscoordinates = polar, filled = [color = red, transparency = .5])

But I'm still wondering about the polarplot...

Best regards!

## extract...

I hope the following URL can give you some advices about how to extract state space, or search for 'statespace' in help document.

http://www.mapleprimes.com/questions/97340-Is-There-Any-Way-To-Extract-The-Matrices

Best regards.

## Thank you...

Thank you very much. I hope maplesim will grow more stronger in the new year, these days I learn some information about here, but I am still confident in the outlook of maple and maplesim, it meets my study and research, and when I post a question in mapleprimes, the response is very timely, this is one of the reasons I choose maple.

Best regards.

## you can use product or palettes...

I think it's simple,

product(i^k, k = 1 .. 2010)

yield which you want.

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