MaplePrimes Questions

Search Questions:

Latest Questions Latest Questions Feed

I have strings like "2009-08-01" as tick marks in a plot. I want them to be displayed vertical... how ?

I have a series of experimental data points (current vs voltage in A and B columns respectively) in excel and would like to open these with Maple 13. I would then want to plot the current vs. voltage relationship plot and find out its trendline and function that best describes this curve.

a separate task is that, i have a set of pre-defined functions, and i would like to see which part (section) of the curve obtained from above procedures can give the best fit to the pre-defined function. I appreciate help from members of the forum.


I want to fill a ComboBox (emb.comb) with data but I dont want to do it manually.

I want to assign a list of 200 values to a ComboBox by using some ?



eq := diff(X(t), t) = (X(t)-1)*(1-2*X(t))


Why doesn't "Preview" show me my Maple code?


Does there exist a simple trick to permanently save imported csv data inside the Maple worksheet.

Everytime I reopen the worksheet I have to import the data again. I want the data to permanently be there.

I tried to specify interface(rtablesize=1000) and the import the data, and copy the data and past it into a code edit region

however my data has 500 columns so it is close to impossible to copy it inside maple it takes 10 min just to copy it

I'm trying to solve a lagrange multiplier problem Max




solving for r and d where 0<=d,r,=<1.    z and x are constants.

I have the problem set up in Maple as

> f:=d*(1-r);

> q:=r^z*(1-(1-r)*d)+(1-(r^z))*(1-d)-x;

> g:=f+mu*q;


> eq2:=diff(g,d);

> eq3:=diff(g,r);



I used eliminate,but there is no result,no error.

I donot know why,what shoud I do?

The programme is in the attachment,the last expression is the eliminate.How should I correct it?View on MapleNet or Download
View file details

Thank you

The command "simplify" fails to capture a fairly obvious simplification. Any way to make Maple see it?

I am primer with maple.

I have the following  nonlinear equation.

EQ:=diff(N(t),t) -kappa/(q-1)*( 1- (N(t)/K )^(q) - (1-N(t)/K)^(q))=0;

I have the following code:

Likelihood := proc (r, t, s) options operator, arrow; product(exp(-(1/2)*((rr(k)-r*cos(t))^2+(ii(k)-r*sin(t))^2)/s), k = 1 .. n) end proc;

rho0 := 0; theta0 := 0; sigmae20 := (sum(rr(k)^2+ii(k)^2, k = 1 .. n))/(2*n);

l1 := Likelihood(rho0, theta0, sigmae20);


Mathematically it should simplify to exp(-n). However, maple seems not able to arrive at this simply solution. What am I doing wrong here?

I have
right-click the expression and choose Explore.  Skip "x" so we have two sliders (a and b)
Select a=-2 and b=0.  In the Math component, you will have
a*x^2-(b+a)*x+b =-2*x^2+2*x
Now, under the two sliders, I add a PLots component.  My wish is to plot the rhs(%Math). 
 In the plot component properties, I edit the "Action when clicked" and write


I want to evaluate a line integral of the vector field F:

F: <x^2 * y, x^3, x*y>

around the curve C: <sin(t), cos(t), 1/4(sin^2(t) - cos^2(t))


When using Line Integral I got the following error:


Error, (in VectorCalculus:-LineInt) the first argument of a Path structure must be a free Vector or a position Vector




> restart;
> with(plots); with(plottools); with(VectorCalculus);
> SetCoordinates(cartesian[x,y,z]);

I have two equations as below,



and I need to plot the graph(x,y), how can I do?

Many thx..



matris is reversible matrix.  x=?




sorry my englis is some bad.


First 765 766 767 768 769 770 771 Last Page 767 of 1137