2020-02-15 17:07:47 -0600 received badge ● Famous Question (source) 2019-02-20 18:08:12 -0600 received badge ● Famous Question (source) 2018-07-20 11:47:07 -0600 received badge ● Famous Question (source) 2017-10-19 23:36:20 -0600 received badge ● Notable Question (source) 2017-10-19 23:36:20 -0600 received badge ● Popular Question (source) 2017-06-16 22:53:11 -0600 received badge ● Notable Question (source) 2017-06-16 22:53:11 -0600 received badge ● Popular Question (source) 2016-11-24 15:46:58 -0600 received badge ● Notable Question (source) 2016-10-19 10:22:20 -0600 received badge ● Popular Question (source) 2016-09-18 15:02:55 -0600 received badge ● Notable Question (source) 2016-09-18 15:02:55 -0600 received badge ● Popular Question (source) 2015-11-03 07:53:23 -0600 asked a question Graphing 3 planes Disclaimer: I'm new to linear algebra and an intermediate with Sage. How can I graph the following planes? This example is taken from Linear Algebra and Its Applications by Strang. I've tried to follow these instructions, but I'm stuck. Thanks! 2015-09-24 10:49:42 -0600 commented answer Graph or plot a system of inequalities This is a clever solution. I didn't know you could use the solver with rhs and plot to graph relations. The problem is that it doesn't shade the inequality's region like region_plot does. 2015-09-24 10:47:48 -0600 commented answer Graph or plot a system of inequalities You beat me to it. I was going to suggest: var("x y") f1 = x >= y^2 + 2*y -3 f2 = y >= x-3 f3 = x == y^2 + 2*y -3 f4 = y == x-3 rx = (-10,15) ry = rx i = [f1, f2] # i meaning inequalities p = region_plot(i, rx, ry) p+= implicit_plot(f3, rx, ry, color="black") p+= implicit_plot(f4, rx, ry, color="black") show(p, axes="true", frame=False, aspect_ratio=1)  2015-09-24 07:34:10 -0600 asked a question Graph or plot a system of inequalities Disclaimer: I'm somewhat new to Sage. Is it possible to graph a system of inequalities in Sage? I'd like to reproduce the following system (top of image) and its graph (bottom of image). Based on (http://www.sagemath.org/tour-graphics...), it seems like I need a region plot, but I'm not sure. 2015-08-05 18:57:59 -0600 asked a question How to plot a parabola (conic): y²=4ax I'm learning about conics, specifically parabolas, and I'd like to plot them. I already know how to do plot(x^2)), but what about y²=4ax ? I understand that representation is a relation, not a function, so that probably eliminates plot(f(x)). But, I'm stuck on how I might plot that so-called "general form" of a parabola. Thanks! 2015-07-22 10:09:16 -0600 received badge ● Notable Question (source) 2015-07-20 09:02:25 -0600 commented answer Label each point very nice! thank you! 2015-07-19 01:04:48 -0600 asked a question Label each point Is it possible in Sage to label each point in a 2-D plot? I'd like to create something like this: 2015-07-13 11:04:20 -0600 commented answer Plots: display period information Perfect! It didn't occur to me to use a list comprehension. 2015-07-12 19:52:22 -0600 received badge ● Popular Question (source) 2015-07-10 16:25:41 -0600 asked a question sin arguments not distributed? In both Wolfram Alpha and Google, I can type the following: 3sin(2(x-(pi/4)))+1 and those systems see 3sin(2(x-(π/4)))+1 (e.g., 2 is distributed to x and π/4)  but when I enter it into Sage Math, it's show(f(x)) indicates 3sin(-1/2π+2x)+1  as shown here: http://picpaste.com/1-3llQDTs0.png (sorry, I can't upload images on ask.sagemath.org since I have less than 60 points) which obviously differs from Wolfram Alpha and Google. What am I doing wrong? Thanks! 2015-07-10 15:32:46 -0600 asked a question Plots: display period information Disclaimer: I'm new to Sage. Is it possible to indicate the period when plotting periodic functions? According to my trig book, for example, "you have a graph that has four complete cycles of the sine curve in the space where you would usually find one", as shown here: f(x)=-2*sin(4*(x+pi/4))+3 plot(f(x),(x,-2*pi,2*pi))  Is there a way to indicate each period? If not, could I approximate it with ticks? Something like: f(x)=-2*sin(4*(x+pi/4)) P=points([(pi,0),(2*pi,0)], pointsize=40, color='red') P+plot(f(x),(x,-2*pi,2*pi), ticks=pi/2, tick_formatter=pi)  2015-07-10 14:14:28 -0600 marked best answer Beginner: Plot sin 2x or 4cos 2x Disclaimer: I'm a beginner with Sage. I'm working with transformations and translations of trig functions, and although I can "plot(sin, (-2,2))" without trouble, how do I plot the following? sin 2x  or 4cos 2x  or 3sin (x+5) -3  Thanks! 2015-07-10 14:14:28 -0600 commented answer Beginner: Plot sin 2x or 4cos 2x Perfect! Thank you for the detail. I was trying sin(2x) not sin(2*x) and getting an error. 2015-07-10 14:13:17 -0600 commented answer Beginner: Plot sin 2x or 4cos 2x excellent! thank you!