I have looked around and can't seem to find anything. Something simple that would provide the number of days eleapsed between two date/times. This comes in handy for radioactive source decay calculations. Thanks, GL

I just started using maple I want to count such thing: ( sum {from j=1 to k} ( x_j - b ) - sum{ from i=1 to n}( y_i - b) )^2 It's a part of longer equation. As a result I need a formula not a value. It is possible to count it with a build-in maple command? I have problems with writing the sum. If not could someone give me a tip how to write a program?

Hi, I need to find the domain and range for x=(1/5)*e^(y/2). How do I do that in Maple? Thanks!

Hello, I have this complicated and messy (complex) function, called ratio, of a variable f0. (Sorry the function is really long). 1) suppose I set f0 = 5.0e9, then evalf(ratio) gives 0.3832106695. 2) if I were to plot ratio via, with(plots): plotr := semilogplot(ratio,f0=5e9..1e12,color=black,numpoints=1000,axis[1] = [tickmarks=[4,subticks=8]],axis[2] = [tickmarks=[4,subticks=5]], view=[1.0e9..1.0e12,0.40..1.00]): display(plotr); then on the plot it shows that ratio > 0.40 at f0 = 5.0e9. Could anyone help please? Thanks! The function is listed below, ratio := 0

Hi, The Trainig video "Using Embedded Components with Maple 11" provides an example using a Button component, a Mathematical Expression component and a Plot component. Since the training video uses Maple 11, the commands in the Button component to get a function entered in the Mathematical Expression component displayed in the Plot component are not applicable if one has Maple 10. I have tried this example with Maple 10 using the SetProperty and GetProperty commands but cannot get this example to work. The command programmed in the "Action when cliked" filed of the button is as follows:

I will have to use an example to highlight my problem, any help would be of great use, Let us take the group {a[1],a[2],a[3]} with a[1]=[1,0,1,0], a[2]=[1,1,0,0], a[2]=[0,0,1,1] now we have combinations of 2 such as a[1]+a[2]=[2,1,1,0], a[1]+a[3]=[1,0,2,1] and a[2]+a[3]=[1,1,1,1], I want to make Maple realise that a[1]+a[2] and a[1]+a[3] are the same as they have the same values in the list even though the order is not the same. from there I want to put them into seperate classes so I have b[1]={a[1]+a[2],a[1]+a[3]} and b[2]={a[2]+a[3]} Been having a lot of trouble trying to do

I have made my own gradient function and now I wanted to redefine the Del/Nabla-symbol i 2D-math to use my function. But I can't get it to work. Any suggestions?

Hi, Can someone please explain the difference between "has" and "depends"? Can you give an example of where they are different? Thanks, Art

Hi, I'm trying to complete two questions. One question is using maple 'to solve the following systems of equations': y=2x-5,y=2x^2+2x-21 I have entered the following code: solve({y=2*x-5,y=2*x^2+2*x-21},{x,y}); The output I get is this: {x = 2*RootOf(-2+_Z^2, label = _L14), y = 4*RootOf(-2+_Z^2, label = _L14)-5} I have no idea what this means apart from the fact that it's wrong but i'm not sure where I have gone wrong. The other question involves expanding the bracket (2x-3)^5 I've input: expand(2*x-3)^5; The output I get is: (2*x-3)^5 Surely this is wrong???!

Hi Folks, I have to believe this is an easy one, but it stumped me anyway. I'm trying to plot an ideal binary VLE curve for two components, and I have equations that describe both my x term and my y term as a function of temperature and pressure. Using the normal plot command, I can get x and y vs. T (if I specify pressure), but how do I get x vs. y (specifying pressure) and either plot T on a second Y axis or ignore it. Thanks in advance. I have my simple worksheet available... Fred Vie

Can someone help me to analytically show that the following series is divergent. sum(ln(1+(1/n)), n = 1..infinity) thanks, respectfully

My class is doing a study in fractals and I have written a program to plot Koch's Triangle for as many iterations as I like. However I am now trying to plot variations of the triangle to build different fractals and I am having problems getting all of the sides to plot properly. I want the picture to look like the 2nd iteration to look like the picture here. Basically an equilateral triangle with equilateral triangles with sides of half the length of the previous iteration. How do I do this 

I have a few questions I am not sure on how to solve for my Math 141 lab....

1)Let f(x)=ax^2+bx+c if x<=50
dx+8 if x>50.

Find Constants{a,b,c,d} such that f(x) is continuous.
f(x) is differentiable.
f(x) has a local extremum of 100 at x=40.


2) Find the equation of the tangent line to the curve y^3+yx^2-3y^2=0 at the point 3,0.

3)Let f(x) = x^3cos(pi*x) find f30(4);

Any help with this question will be much appreciated. I have a set with 15 elements and i have broke them down into all the possible subsets using the powerset function. I have also assigned the elements to a vector. I want to sum all the elements of each subset. ie The set {a,b,c,d} has all the subsets {{},{a},{b},{c},{a,b},{a,c},{b,c},{a,b,c}} with these assignments let us say a:=[1,0,0], b:=[0,1,0], c:=[0,0,1] I want results such that i have a, [1,0,0] b, [0,1,0] c, [0,0,1] a+b, [1,1,0] a+c, [1,0,1] b+c, [0,1,1] a+b+c, [1,1,1] Is there any way to write a Maple function to carry this out?

Please help with these additional questions. (1) The covariant components of a second order tensor with respect to the basis e[1]=i[1]+i[2], e[2]=i[2]+i[3],e[3]=i[1]+i[3] are given by (a[ij]) = array([[2,0,1],[-1,2,0],[0,2,-1]]) Find the components a^ij, a[i]^k, a[k]^i