## prime notation setup changed in Maple 2017...

Not sure if this is documented explicitly to Maple users, but normally (prior to Maple 2017) interface(typesetting=extended) was all that was required to output display diff(y(x),x) as y'(x)

With Maple 2017 typesetting=extended is default and one must use with(Typesetting)  Settings(typesetprime=true) in order to output the display of diff(y(x),x) as y'(x).

Perhaps this is well documented somewhere, however I was unable to find the change.

## make latex() generate y'(x) for diff(y(x),x) ?...

I know the latex() command in Maple have many issues and I have no hope of what I will ask having a solution, but thought to ask any way.

Is there a way to make maple generate the latex for all the derivatives to use ' instead of d/dx ?

for example, given this

ode:=diff(y(x),x)=x;
latex(ode,output=string);


The Latex generated (which is correct) is

{\frac {\rm d}{{\rm d}x}}y \left( x \right) =x

but sometines I find it more readable if the latex was

y'(x)=x

which is more common in textbooks and other places. The problem also is that I am using worksheet so can't use  y'(x) as input.

But even switching to document mode, and writing it 2D math as input, the Latex output still does not match the input

So if there is a solution to this, would it require changing the latex() command itself? or can it be done at user level?

I'd like all orders of derivatives anywhere in the equation to come out as y'' etc.. so diff(y(x),x\$3) should generate the latex y'''(x) and so on.

Is there a trick to do this?

Maple 2017.2

## How can I group certain variables and integers of ...

I'm still quite new to maple and I'm working calculating some dynamic equations.

I want to be able to selectively group certain variables or numbers depending on how I need the equations to be showed, I don't know if that's possible, I´ll explain further.

In typewritting extended format one equation is shown like this:

And maple standard:

The fisrt thing I want is to show the time derivatives in the dot representation, but I also want the 1/2 multiplyting each term of the whole equation like in the maoke standard format.

I also need to group certain variables in some other equations I have and I was wondering if there is a way to do this.

## Derivative of a summation in order to a single ter...

doubt.mw

Equation21v2.mw

Hi,

When I do the derivation of a summation in order to one single term should not the result come out of the summation in the example attached in the file doubt? for example the derivative should not have yielded Ci and not the summation of Ci because for example if want the derivative in order to y1 it should be only C1 and not the summation of Ci.

The same happen when I go to a more complex case like in the file Equation21v2, should the result in the last double summation before T drop the summation over i to NC?

## Manipulation of derivative symbolically ...

Dear friend,

please suggest a way for manipulation of derivative of a function symbolically. Assume

Typesetting[Suppress]([f(x)]);
Ex1 :=expand(diff(f(x+y)+x*f(x-y), x)^2)+expand(diff(f(x-y)-y*f(x+y), x)^2);

Result is as needed:

Ex1 := (D(f))(x+y)^2+2*(D(f))(x+y)*f(x-y)+2*(D(f))(x+y)*x*(D(f))(x-y)+f(x-y)^2+2*f(x-y)*x*(D(f))(x-y)+x^2*(D(f))(x-y)^2+(D(f))(x-y)^2-2*(D(f))(x-y)*y*(D(f))(x+y)+y^2*(D(f))(x+y)^2

But later I cannot use D(f) as a function. Expressions

subs((D(f)) = (t -> 1-t), Ex1);
subs(diff(f(x),x) = (t -> 1-t), Ex1);

do not handle it as a function.

## weak derivation ...

Hello

Can Maple compute the weak derivative of piecewise function like

f:=x->piecewise(0<x and x<0.5,x,0.5<x and x<1,1-x,  elsewhere 0);

Many thanks

## How do i find extremas of implicit function?...

When function is given as two variables, how to find extremas? help thanks

example: z=x3+y3-3xy

and alse the function as given condition z=x+2y, x2+y2=5

## How to differentiate an equation having fluctuatin...

I have an equation were build with many unfixed numbers of variables as below:

eq:=f(U[i,j],V[i,j],W[i,j],S[i,j],T[i,j]), i,j=0,1,2,...(changing during the program running)

How do you suggest to calculate the first derivative of such equation with respect to U[i,j],V[i,j],W[i,j],S[i,j],T[i,j]?

Suppose that i,j=22, in this way to calculate the metioned derivative with respect to U[0,0] only, I must write:

diff( eq(U[0,0],U[0,1],U[0,2],...U[22,22], V[0,0],V[0,1],...,T[22,22]), U[0,0])  ( More than 2420 terms)

As you see it needs cumbersome writings if i,j be constants, and because the i and j are changing during the program, I dont know how to cope with this derivatives in Maple??

## Fracdiff give weired results...

I have recently been working on a problem using fractional calculus and have come across something in Maple's fracdiff  command that makes no sense to me.

fracdiff(1, x, 1/2) = 0

It should be:     1/(sqrt(x)*sqrt(Pi))

Thanks.

fracdiff.mw

## Optimization Problem- Difficulty...

I'm inputting an optimization problem into Maple, and somewhere along the way my code stops working.  (Code is at the bottom.)

I need to find the second derviative for my Profit statement [(p-c)d]. I know the first derivative, deriving for p is, is d. d=ap-b, so deriving that statement for p should equal −abp−b−1 . For some reason, Maple is showing my second derivative as equal to zero.

Can anybody help me? TIA!

restart;

Profit := (p-c)*d;

d;=ap-b;

print(Solution);

dProfit1 := diff(Profit, p);

dProfit2 := diff(dProfit1, p);

ddProfit2 := diff(Profit, p, p);

pOpt := solve(diff(Profit, p));

Profit:=(p-c)ap-b

d:=ap-b

Solution

dProfit1:=ap-b

dProfit2:=0

ddProfit2:=0

pOpt:={ap=0, b=b)

## plotting Derivative as an axis of a graph...

For the PDE, I can't seem to plot T' as the y-axis, it gives me the error, "Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct". Anyone knows what seem to be the problem? I am open to all ideas and would appreciate any help:)

fyp3.mw

## How can D((x+y)^a) be calculated as D((x+y)^2 is?...

Hello people in mapleprimes,

I hope that you will give me an answer about the calculation surrounding D.
D((x+y)^2) can be calculated with maple, but D((x+y)^a), where a is a constant, cannot at least directly.
And, I have the code, which Mr. Carl Love kindly gave me at
http://www.mapleprimes.com/questions/218045-Logarithmic-Derivative
, which is

h:= F-> expand(evalindets(D(F)/F, specfunc(D), d-> op(d)*'h'(op(d))));

This works for (x+y)^2, but does not work for (x+y)^a.
And, I think this reason is that the behavior of D to (x+y)^2 is not the same
as that to (x+y)^a.
And, I want to modify this code.
But, I can't .
So, I am asking this question. How should I modify the above code so that it works for (x+y)^a.
I'm so sorry for a lot of impoliteness.

Take care.

taro

## solve Derivative in maple...

solve Derivative in maple

see in photo

## Jaggered graph for fdiff function...

For my fdiff graph, it seems that the cirtical points appear to be jaggered or not smooth. Anyone nows what seem to be the problem? i tried increasing the numpoints but it did not work:( I am open to all opinions. Thanks:)

fyp2.mw