Linked Questions

17
votes
3answers
14k views

Easiest way to plot a function with PGF/TikZ

I am new to TikZ and/or PGF (whatever the difference is :/), as you can see. Anyway, I need to draw the graph of the equation x^(2/3) + y^(2/3) = a^(2/3), where a = 2. Any suggestions? Here is what I ...
7
votes
2answers
5k views

Graph of polynomial, scaling y-axis

I'm new to TikZ and to this site, so forgive me if a similar question has already been asked. I'd like to graph the polynomial function f defined by f(x) = x3 - 6x2. I want the y-axis scaled so that ...
27
votes
1answer
3k views

Why is \parskip zero inside a minipage?

This question was originally entitled "inconsistent paragraph spacing with \parskip inside minipage" as the MWE below shows. But I found the answer at How to preserve the same parskip in minipage, ...
15
votes
1answer
4k views

Defining a Piecewise Function for PGFplots

I want to define a piecewise function q(x), and attempted to adapt the solution to this question on using pgfmathdeclarefunction to create a unit pulse function, and this works fine. However, when I ...
6
votes
2answers
4k views

pgf-tikz problem with 'declare function'

I need to make a plot of a non-linear functions. To get familiar with the 'declare function' capability of pgf-tikz, I tried the following code: \documentclass[10pt]{article} \usepackage{amsmath} \...
8
votes
1answer
2k views

User-defined math functions with pgf

I'm trying to use user-defined math functions with pgf to make a plot. The plot will consist of several straight lines given by a function of three arguments. (I know there are easier ways to do this, ...
5
votes
2answers
229 views

How to make latex parse `x` as an argument of a macro definition instead of `#1`

When I define a mathematical function for plotting in pgfplots or pstricks I usually to it in the following way: \def\f(#1){(#1)^3 + 3*exp(#1)} just as suggested by Jake in his answer to a question ...
6
votes
1answer
262 views

Unintended line thickness variation with pgfplots

I admit that I may be abusing pgfplots somewhat, but I want to add a plot of a function into a tikz-picture in a certain way. I have now managed to get this to run, I'm just wondering why the line ...
2
votes
1answer
1k views

Consistently specify function to be graphed with or without gnuplot

I would like to be able to specify a function and then graph that with with pgfplot only, or use gnuplot to compute the coordinates. As far as I know there are two main differences in how the ...
1
vote
4answers
400 views

Can I connect the end of an \addplot to the beginning of the next \addplot?

I'm using pgfplots to plot an implicit equation, but I'm running around using gnuplot by parametrizing the curve instead. The down side is that my parametrization necessarily comes in curve segments. ...
0
votes
1answer
259 views

How to draw this graph in pgfplots or tikz?

I have a picture With Mathematica I found formula of the curve is 6.12465 - 0.206646 x - 4.42686 x^2 - 2.58476 x^3 + 3.53276 x^4 + 3.78595 x^5 - 2.30475 x^6 - 1.91715 x^7 + 1.0322 x^8 + 0.430597 ...