Ask Your Question

bxdin's profile - activity

2020-03-31 12:08:16 -0500 received badge  Famous Question (source)
2020-03-11 23:22:36 -0500 received badge  Famous Question (source)
2019-10-31 05:10:41 -0500 received badge  Famous Question (source)
2018-06-06 02:34:30 -0500 received badge  Famous Question (source)
2018-06-06 02:16:52 -0500 received badge  Famous Question (source)
2018-06-06 02:16:52 -0500 received badge  Notable Question (source)
2018-06-06 02:16:52 -0500 received badge  Popular Question (source)
2018-02-16 06:07:28 -0500 received badge  Famous Question (source)
2018-01-16 05:06:48 -0500 received badge  Famous Question (source)
2018-01-16 05:06:48 -0500 received badge  Notable Question (source)
2017-08-23 15:28:26 -0500 received badge  Notable Question (source)
2016-11-29 16:24:24 -0500 received badge  Notable Question (source)
2016-11-29 16:24:24 -0500 received badge  Popular Question (source)
2016-09-05 10:16:58 -0500 received badge  Notable Question (source)
2016-07-20 21:32:23 -0500 received badge  Famous Question (source)
2016-06-19 05:25:19 -0500 received badge  Famous Question (source)
2016-06-01 23:44:59 -0500 received badge  Famous Question (source)
2015-10-11 09:05:56 -0500 received badge  Popular Question (source)
2015-08-07 07:04:44 -0500 received badge  Notable Question (source)
2015-08-06 07:54:57 -0500 received badge  Notable Question (source)
2015-08-06 07:54:57 -0500 received badge  Popular Question (source)
2015-08-01 07:42:48 -0500 received badge  Popular Question (source)
2015-04-07 10:46:01 -0500 received badge  Notable Question (source)
2015-01-14 07:58:12 -0500 received badge  Popular Question (source)
2015-01-14 02:51:55 -0500 received badge  Popular Question (source)
2014-10-31 11:26:44 -0500 received badge  Nice Question (source)
2014-10-26 08:57:43 -0500 received badge  Notable Question (source)
2014-06-29 11:55:37 -0500 received badge  Popular Question (source)
2014-06-29 11:55:37 -0500 received badge  Notable Question (source)
2014-06-29 11:55:37 -0500 received badge  Famous Question (source)
2014-06-29 11:53:38 -0500 received badge  Popular Question (source)
2014-06-29 11:53:38 -0500 received badge  Notable Question (source)
2014-06-29 11:53:38 -0500 received badge  Famous Question (source)
2014-06-29 04:05:52 -0500 received badge  Famous Question (source)
2014-04-23 10:59:12 -0500 received badge  Notable Question (source)
2014-02-04 12:41:49 -0500 received badge  Popular Question (source)
2013-12-07 01:12:08 -0500 received badge  Notable Question (source)
2013-11-28 03:22:30 -0500 received badge  Popular Question (source)
2013-10-20 11:34:50 -0500 received badge  Popular Question (source)
2013-09-28 02:10:14 -0500 asked a question function division

I plotted the 2 following equations: (2x^3+2x) / (x^2+1) 2*x

p1 = plot((2*x^3+2*x) / (x^2+1), (x,-15,15), ymin=-15, ymax=15)
p2 = plot(2*x, (x,-15,15), ymin=-15, ymax=15, color='red') 
p0= p1+p2
show(p0)

And they both displayed the same output: I tried to do, (2x^3+2x) / (x^2+1) , but was displayed, 2*(x^3 + x)/(x^2 + 1)

How can I get 2*x to be displayed as the output?

2013-09-26 00:34:24 -0500 received badge  Popular Question (source)
2013-09-15 05:29:57 -0500 asked a question Decimal to fraction?

I did .1/8, and the output was 0.0125000000. Is there a way to get it to display as 1/80.

2013-09-07 03:37:33 -0500 asked a question Plot a polar curve given the radius?

Essentially, a question reads: Graph the polar curve r = 4cos(2?), where ? is a radian angle.

The graph of the curve looks like a 4 leafed clover.

The following function, r=3cos(?), looks like a circle centered at (3/2, 0).

2013-09-03 07:16:08 -0500 asked a question Take a screenshot, and transfer it to a windows partition/drive path?

I currently run Sage math 5.9 through, VirtualBox Fedora linux virtual machine, on Microsoft Windows 7.

I performed the following calculations.

eq1i = integral( sqrt( 1 + 1/(4*x))  )
f(x) = eq1i.subs(x=x)
show(eq1i)
float( f(4) - f(1) )

As you may see, I did show(eq1i), to display the integral result in a more readable format. I'd like to to take a screenshot of my results in Sage, so then I can use an image editing program in Windows, such as MS Paint or Adobe Photoshop, and crop out the result of show(eq1i), result.

2013-09-01 04:16:45 -0500 asked a question The plot of x=ln(y) looks just like y=ln(x)

According to the author, x=ln(y) should go through y=1, not x=1, making the plot look similar to a half U on the positive side of the x-axis, instead of a half C, on the the positive side of the y-axis.

var('y')
f=ln(y)
plot(f, (x,-5,5), ymin=-5, ymax= 5, aspect_ratio=1)
2013-08-29 13:32:34 -0500 commented answer Plot a circle, by utilizing an equation solved for x

Awesome, thanks.

2013-08-28 17:40:07 -0500 asked a question Plot a circle, by utilizing an equation solved for x

The following code is an example of plotting the equation: x = y^2-3x-5y+7, i.e. an equation solved for x:

var('y')
f = y^2-3*x-5*y+7
Yax = x
Xax = y
p1= implicit_plot(f, (x,-4, 4), (y,-2, 6))
p3= implicit_plot(Yax,  (x,-4, 4), (y,-2, 6),color='black')
p4= implicit_plot(Xax,  (x,-4, 4), (y,-2, 6),color='black')
p0= p1+p3+p4
show(p0)

According to the author, he solved the following equation in terms of x: x^2+y^2 = 25 He got the following: x = sqrt(25 - y^25) and x = -sqrt(25-y^2), i.e. ± sqrt(25 - y^25).

According to him, he plotted the 2 separate results to obtain a circle plot/graph.

How can I generate such an output on Sage 5.9?

The following was my best attempt, but I received no output for the plot of: sqrt(25-y^2):

var('y')
f = sqrt(25-y^2)
Yax = x
Xax = y
p1= implicit_plot(f, (x,-50, 50), (y,-50, 50))
p3= implicit_plot(Yax,  (x,-50, 50), (y,-50, 50), color='black')
p4= implicit_plot(Xax,  (x,-50, 50), (y,-50, 50), color='black')

p0= p1+p3+p4
show(p0)
2013-07-30 04:02:41 -0500 received badge  Nice Question (source)
2013-07-29 13:19:45 -0500 asked a question Display x-intercept of a plot, involving x raised to the 3rd power.

The following is my syntax to generate the plot:

e1= x^3 + 4*x - 7
f(x)= e1.subs(x=x)
p1= plot(e1, (x,-15,15), ymin=-15, ymax=15)
p0= p1
show(p0)

Now to try and generate where on the x-axis the the plot crossed, 1.255 according to the author, I tried to get sage to solve for x, but it generated irrelevant answers:

ans = (solve(x^3 + 4*x - 7 == 0, x))
print (ans)
show(ans)

I tried substituting the value that didn't include imaginary into the original equation: x^3 + 4*x - 7, I got 1.333 x 10^-15, which is totally different from the author's.

The original question was: given f(x) = x^3 + 4*x - 2, one needs to evaluate f^-1(-5).

2013-07-28 11:31:46 -0500 edited question Implicit differentiation displays extraneous x variable.

The problem is, given y = 9*x^(1/2) - 2*y^(3/5), find dy/dx The answer is supposed to be dy/dx = ( 45*y^(2/5) ) / ( 10*x^(1/2)*y^(2/5)+12*x^(1/2) )

When I enter the following syntax, there is an extraneous character, (x), displayed:

y=function('y',x)
temp=diff(9*x^(1/2) - 2*y^(3/5) - y)
solve (temp,diff(y))
show(solve (temp,diff(y)))

Is it possible to display the answer without showing (x)?