## Restrictions of parameters fit ??...

Hi, I have a problem with fit parameters restrictions. I would like to give restrictions of the parameters of my fit in order to get the best fit parameters, but the "parameterranges" seems to be not in function. my function is following: > y1 := piecewise(0 <><>

## Writing ODEs in text...

I'm trying to write a document in Maple 10 that includes some ODEs. I want these to be either text or math inputted in the form dV/dt = V [f(S)-r] (where V is a function depending on t and f is a function dependent on S that I want to introduce later in the document). It would be good if they could be inputted in math form so that they have labels but ideally i want them in a clear non-Maple form like above rather than somthing like V'(x)= V(x)*[f(S) - r] which is what I keep getting (or other similar things like it including Maple solving V'(t) and outputting zero which is not at all what i need)

## subs issue....

I am trying to use the subs command to take a general solution to a differential equation and apply some numerical values. I can't seem to get the system to recognize the values I am substituting for. Consider the following: m*diff(y(t),t,t)=-m*g+sigma*A*diff(y(t),t); (1) y(0)=h,D(y)(0)=0; (2) dsolve( {(1),(2)} ); (3) subs( {A=2,m=50},rhs((3)) ); Everything works fine. If, on the other hand I impose any kind of constraint on A or m in the original equation then the substitution fails (nothing happens). Clearly the system has tagged the value for A and m as something other than their original name. Since the system doesn't report this name change how can I make substitutions after a symbolic manipulation like this?

## Have a 2d plot of a 3 variable polynomial?...

Hi, I'm new to Maple so please forgive me if this seems really easy but I can't seem to find it in help anywhere. Basically, I have an equation that is a function of x, y, and t (where t is time). Instead of a 3-D plot, I would like to display a 2-D plot with x-axis and y-axis and have 5 lines of the equation at various intervals of t (t=0, t=1, t=3, t=5, t=20, etc.). Thank you very much for the help, KC

## Saving Plots from a Maplet...

Does anyone know if there is a way to save plots in a maplet? The following does not produce the expected .ps file:

## Integration...

hey all,i finding how to solve integration on maple rather tricky.I need 2 find the numerical area of the region above the x-axis which is restricted by the curve y=5sinx-3x^2+5 and the x-axis. how can i do this? any suggestions will be gratefully received.

## Function equations...

Hi, i'm new to using maple, and so far been ok solving equations, by figuring out the code forthis has got me stumped and would appreciate any help people can give me. basically i'm trying to find the smallest value of x>0 for which the function f(x)=sinx/x has a minimum and to find the coressponding value of the function. However i keep getting error messages, as my code probably does not make sense. could any one help pls? thanks.

## Solve linear equations...

hi, I want to solve linear equations with the assumption that Maple round every step of the evaluation accurate to 2 decimal places. for example: > solve({1.11 x - 2.13 y + 1.14 z = 1.23, 0.32 x + 1.44 y + 3.02 z = 4.10, 1.27 x - 1.14 y + 2.54 z = 5.67}, [x, y, z]) x=19.59 y=7.38 z=-4.24 and not [[x = 19.09759807, y = 7.184806478, z = -4.091838645]] thx for your help

## Extracting derivatives of functions from an expres...

Does anybody know of a way to extract derivatives of a specified function from an expression? For example, if I have the expression, int(D[6](F)(x,t,y(x,t),diff(y(x,t),x),diff(y(x,t),t),diff(diff(y(x,t),t),x))*diff(diff(yv(x,t),t),x),t = t1 .. t2); I'd like to be able to get the derivatives of yv(x,t) which in this case would be, diff(diff(yv(x,t),t),x). I ask because I'm trying to systematically integrate a set of expressions by parts where I know that the dv term always contains a certain function's derivatives and I can stop integrating by parts once I have just the function.

## Making vector symbols with maple 10...

Hello, I am new to maple and I am trying to create letters with the arrows and hats over them so they can represent vectors. I looked at all of the different fonts included in Maple and none of them that I saw had any characters with arrows over them. I looked at all of the shortcuts and I didn't see a way to type stuff directly above a letter, beacuse maple has letters and it has arrows so if there were a way to do a superscript of the arrow except directly over the letter that would work. I also looked at the symbol definitions, and I looked through maple help. I found an overwhelming amount of help for the commands, but nothing for a simple formatting issue.

## Maple 10 teacher edition...

How much is MapleSoft charging High School teachers for a copy of Maple 10? Do they get the full version??

## Installing Maple...

I tried to install Maple 10. At the end the Maple installer prompts me to restart my computer. ONce I press the restart button , the installer just sits there. I rebooted the machine by depressing the on/off button. Maple seems to be working on my computer for now. Should I install Maple again (after removing it) or should I leave it alone? Has anyone else experienced the same installation situation?? Thanks!!

## collect function...

Hi, I'm having trouble getting the collect function to do what I want. Namely, I would expect collect( a*x^b + x^b, x) to return (a+1)*x^b. Here, a and b are variables. Collect only seems to work if either a or b has a defined value (e.g. a=2, b is undetermined). What am I doing wrong here?

## Open Maple, arrays and memory copy...

I have the following: arrays arrC of type double in a C code and a fct in Maple allowing arrM of type Array(datatype = float[8]) as argument. I want to evaluate the fct using arrC as input. For that one can either use 'MapleAssignIndexed' (looping through the elements if there are not very much of them), or 'RTableCreate' (details omitted). Both seem to need some overhead which costs time. Is there a way to use something like the C function memcpy to copy the array to Maple (assuming the correct space can be supplied) to speed it up? Does one have to work with byte arrays instead for that - or is it