Alex89's profile - activity

Noted. I upgraded and it works. Thanks alot.

Sage 9.0 on Ubuntu 20.04. Guess I gotta change vers.

V1 = vector([3,2,1])
V2 = vector([2,3,5])
V3 = vector([1,2,3])

plot(V1, color='red', gridlines='minor') + plot(V2, color='yellow') + plot(V3, color='blue')

What's up with the graph? Why are the lines not shown as vectors and why do they not change color?

I didn't know what version you wanted me to install so I installed both that are available on Ubuntu-20.04.

firefox-esr 68.12 has the same issue, plot3d() does not show anything.

firefox-esr 78.2 the issue seems to be gone, plot3d() works normal.

sudo apt-get install sagemath

Ubuntu 20.04 / Firefox 80.0.1 / Sage 9.0 / Sage was installed via terminal.

Yesterday I switched my browser from Chromium to Firefox and when I try to use plot3d() the output shows no graph.

f(x,y) = x^2 + y^2 - x*y
plot3d(f,(x,-8,8),(y,-8,8))

Everything is white where the graph should be. I do see the small i at the bottom right of the window, but nothing else. Am I doing something wrong here?

Ubuntu 20.04 / Firefox 80.0.1 / Sage 9.0 / Sage was installed via terminal.

I have a question about the plots made by SageMath compared to other CAS.

Why does it make the straight line between the two curves? It's like Sage is plotting the vertical asymptote without the user asking for it.

It does this to all the functions in the form of 1/x. I have not seen this type of plotting in Mathematica or Desmos, which made me wonder why the difference. Thanks.

sage: f(x) = x^2/(x+1)
sage: plot(f, (x,-3,2),figsize=10, ymax=8,ymin=-8)

or

sage: plot(1/(x+1), (x,-3,2),figsize=10, ymax=8,ymin=-8)

Can anyone please tell me what am I doing wrong here? I always have issues with solve() for some reason.

sage: f(x) = (474.89/265.41)^(1/x) - 1
sage: solve(f(x) == 0.1, x)
sage: [47489^(1/x) == 11/10*26541^(1/x)]

Replacing 0.5 = 1/2 seems to work:

sage: var('x')
sage: solve((x-1)^1/2-(2*x-3)^1/2-(3*x-4)^1/2==0,x)
[x == (3/2)]

If you write the equation into a function you get two different functions for some reason, so I don't really know what the problem is. Maybe the devs can help us here.

sage: f(x)=(x-1)^1/2-(2*x-3)^1/2-(3*x-4)^1/2
sage: g(x)=(x-1)^.5-(2*x-3)^.5-(3*x-4)^.5
sage: plot(f(x),(x,-4,4)) + plot(g(x), (x,-4,4), color='red')

This is perfect. Thank you!

I did the changes, now I get a wrong answer.

I don't understand why did you bother to respond if you have no idea why Sage does not compute a definite integral of a normal distribution. And no this is not a homework. I solved it in Desmos in 1 minute. I just wanted to learn how to do it in Sage since I wanted to learn how to use it better. I had no idea that you have to be an expert to even ask questions around here.

This is what I want to do in Sage. It can be done very easily in Desmos. https://www.desmos.com/calculator/m6g...

I am just trying to do this integral in Sage. When I do it the answer I get is

f(x) = (1/3.33sqrt(2pi))exp((-1/2)((x-9.486)/3.33)^2)

N(definite_integral(f(x), x, 6, 23))

5.35572539176154

This is what I want to do in Sage. It can be done very easily in Desmos. https://www.desmos.com/calculator/7oc...

I am just trying to do this integral in Sage. When I do it the answer I get is

f(x) = (1/3.33sqrt(2pi))exp((-1/2)((x-9.486)/3.33)^2)

N(definite_integral(f(x), x, 6, 23))

5.35572539176154

Hey guys, I'm trying to plot this function into Sage and it does not work for some reason.

g(x) = binomial(3,x)*binomial(3,2-x) / binomial(6,2)

plot(g(x), (x,0,2))

Nothing shows up.

Hello, I'm trying to use r.plot() in Sage9.0, but when I do I only get null device 1 as a output in Jupyter. Can someone please tell me what exactly I'm doing wrong here? I'm on ubuntu18.04.

x <- r([1,2,3,4,5]) y <- r([2,3,4,5,2]) r.plot(x)

null device 1

Thanks for this one. Wish they made R more interactive in SageMath.

Thank you for your answer, the result is what I was looking for. Sucks that solve() does not work with logs.

Thank you for your answer, the result is what I was looking for. Sucks that solve() does not work with logs.

I am sorry, I messed up the log function, I wanted the log of a2 in base 10 - log(a2, 10). However when I corrected my mistake the function still doesn't work.