## 599 Reputation

13 years, 283 days

## automatically input times steps into out...

Maple
I am using the output=array([]) option in dsolve which works fine if I write in each time step of interest eg output=array([0.1,0.2,0.3]). No problem for 3 values. However, I wish to input a large number of values. Can this be automated for regular time steps?

## differentiate the unit vector of a rotat...

Maple
I have a frame where u_n and u_t are perpendicular unit vectors with u_n pointing to the right and u_t pointing up. Where the frame is rotating with angular velocity w in the anti-clockwise direction and time is t then d(u_n)/dt = w u_t How do I set Maple up so that it will do a symbolic differentiation of unit vectors - or any vector - in a rotating frame?

## Save a worksheet session...

Maple
I have a large system of equations that takes a good hour to solve. Each time I save and reopen the worksheet there is another lengthy recalculation on execution after which other operations are carried out. I know how to save individual variables for reuse but what I would like to do is save the session so that the I can pick up from where I left off. Is this possible?

## Assign a symbolic solution in a vector t...

Maple
I have a vector containing a variable >vec1[1]; var1 I have another vector containing a symbolic solution. >vec2[1]; a + b + c I wish to assign a + b +c to var1 so that >var1; a + b_+ c How do I do that? All of my usual methods seem to come unstuck.