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trivial problem with trying to graph 2 functions

asked 2016-07-14 15:41:45 +0200

Henry J gravatar image

updated 2016-07-14 16:35:14 +0200

kcrisman gravatar image

I'm very new to SageMath. I want to plot two functions on 1 graph. Here is the code

def draw1st_2nd_Order( k1=slider(0.01, 10, 0.1, 5, label = "k1 (s^-1)"), k2=slider(0.01, 10, 0.1, 5, label = "k2 (M^-1s^-1)" ) ):
    f(t) = 10*e^(-k1*t)
    g(t) = 10/(1+(10*k2*t))
    P1 = plot( f(t), 0, 10, ymin=0, ymax=10, color=’blue’, gridlines='minor') 
    P2 = plot( g(t), 0, 10, ymin=0, ymax=10, color='red')
    print "The x-axis is time in sec."
    print "The y-axis is [A] in mM."    

This is the error I get:

File "<ipython-input-1-8e804a2c9a22>", line 5
    P1 = plot( f(t), Integer(0), Integer(10), ymin=Integer(0), ymax=Integer(10), color=’blue’, gridlines='minor')
SyntaxError: invalid syntax

I'm trying to convert lots of Mathematica files to SageMath for an online biochem text. Once I get this example worked out, I can easily convert the rest. Any help would be greatly appreciated Henry J

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You may enjoy for a good free introductory Sage text relevant to your audience in terms of level.

kcrisman gravatar imagekcrisman ( 2016-07-14 16:37:51 +0200 )edit

If you are writing a text that has significant online Sage (or R, or whatever) interactive content and needs good technical formatting, I recommend a look at

kcrisman gravatar imagekcrisman ( 2016-07-14 16:39:54 +0200 )edit

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answered 2016-07-14 16:37:15 +0200

kcrisman gravatar image

This is really subtle, and is no doubt related to a copy-paste issue.

You have color=’blue’. Notice how the quotes lean forward a bit. That is not a standard Python string delimiter; you need normal (ASCII) single or double quotes. Here you can see what you get if you use color='blue' as correct.

Looks good otherwise! Welcome to Sage! I'll put some other comments in the, well, comments.

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Asked: 2016-07-14 15:41:45 +0200

Seen: 262 times

Last updated: Jul 14 '16