{pgfmath} concerns the pgfmath library used for internal computations in TikZ-pgf but which is also available for other computations in (La)TeX.

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error function graph [duplicate]

Is there a simple way to plot the error function in latex? Something like the graph shown in the wikipedia page would be great. The function doesn't seem to exist in pgfmath. ...
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1answer
12 views

2D array with floats

The following code is working for integers in \myArray, but not for floats. How can I make this code working for floats? \documentclass[a4paper]{article} \usepackage{tikz} \begin{document} ...
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0answers
66 views

Animation with sinusoidally moving arrows

I am trying to create an animation using animateinline and it's my first. This is the frame layout: http://i67.tinypic.com/bfj7s2.jpg Below is my code so far. I can't figure out how to get the sine ...
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0answers
19 views

Fill column with random numbers using datatool and PGF

Consider the following csv file: column1,column2 line1, line2, I want to fill column2 with random numbers, preferably using PGF (simply because I already know a bit about PGF, but I am open to ...
5
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1answer
131 views

rounding to one decimal woes…

I have a problem with rounding --- I have seen How do I get \pgfmathparse to create value rounded to one decimal place? but still I can't obtain the result I need. See this MWE: ...
4
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3answers
272 views

How to increment variable by using same variable?

How can I increment variable from the same variable? \pgfmathsetmacro\S{5}; \pgfmathsetmacro\S{\S + 1};% not working How can I work around this? I need counters which I use as line coordinates ...
4
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0answers
41 views

pgfplots: math expressions of variables in axis style

I would like to use a calculated value of pgf variable exp(\pgfplots@data@xmin) This is a concrete example what I need \documentclass{standalone} \usepackage{pgfplots} \pgfplotsset{compat=newest} ...
3
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0answers
50 views

Remove the first and last values of xtick and ytick

I use the following code to create a tufte-like range plot as suggested here: Tufte like axis with pgfplots \documentclass{standalone} \usepackage{pgfplots} \pgfplotsset{compat=newest} \makeatletter ...
3
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2answers
81 views

Constructing arcs using \pgfpatharctoprecomputed

I am having trouble producing an arc from a well-defined ellipse using \pgfpatharctoprecomputed. My code is: \documentclass[tikz,convert={outfile=\jobname.svg}]{standalone} \usepackage{tikz} ...
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1answer
34 views

pgfmathdeclarefunction with savebox and tikzexternalize: tikzpicture optimized away

Having solved my previous problem involving \savebox and \tikzexternalizeI am already facing the next one. I would like to use a function that I have defined either in or after the preamble with ...
10
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4answers
285 views

What is the difference between points, coordinates, and anchors in TikZ/PGF and how can I deal with them?

I should note that I am already familiar with TikZ and am I am looking for technical answers, as if TikZ weren't technical enough. This question boils does to the following question, what is the ...
5
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3answers
178 views

serious scientific calculating with small numbers, using different methods

I got stuck in a problem with pgfmath module. When trying to calculate the following functions values the result that gets printed out is always zero. I guess the problem is an underflow of pgfmaths ...
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4answers
101 views

Programming a step function- part2

Based on a macro given by egreg in this question: Programming a step function I obtain a program which tests in which interval is a number \alpha, between the numbers bone, btwo, bthree, bfour. I use ...
3
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2answers
126 views

Dimension too large with \pgfmathsetmacro

I want to define varafterglowepsdown, varafterglowa and varafterglowb and use them in a tikz function like this: \newcommand{\varafterglowepsdown}{0.0001} ...
0
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0answers
79 views

Real-time editor(whiteboard) using Latex Editor

After studying tex for more then 3 weeks, I am still wondering, how can I create a real-time editor(whiteboard) to prepare notes with complex structure. Suppose I am having dictionary of latex symbols ...
4
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1answer
173 views

\pgfmathprintnumber and pre-defined styles

In text mode I would like to use \pgfmathprintnumber to print numbers in an uniform style. The style used shall be defined in the preamble of the document. See the following MWE: ...
8
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2answers
70 views

Applying and doing math on two functions read from a file using pgf

I'm trying to read two functions of x from a file, and then get the result of f(8) / g(8) using pgfmathparse. Here is a minimal (not) working example: \begin{filecontents}{data.dat} f(x) g(x) x ...
4
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0answers
75 views

Problem with decorations in a small TikZ picture

When working on yesterday's update on my answer to the december challenge (a dcorated tree), I encountered a problem: if I choose the picture's dimensions to small, then it fails with Dimension ...
9
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1answer
180 views

pgfmathsetmacro issue in foreach

I am trying to use \pgfmathsetmacro inside a foreach loop to connect nodes which are adjacent and named according to position as follows: \foreach \src in {0,...,\T}{ ...
0
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1answer
67 views

Exponent with more than 1 digit [duplicate]

How can i format an exponent with more than one digit? For example i want $10^20$ and latex gives me 10^2 and 0.
2
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3answers
135 views

Evaluate binomial coefficient with \pgfmathtruncatemacro

How is it possible to evaluate complex formulas like \binom{2^{4}-3}{2^3} with \pgfmathtruncatemacro ? I want this to evaluate to 1287. What already works: \begin{tikzpicture} \foreach \l ...
5
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1answer
95 views

Why does pgfmaths's ifthenelse evaluate both expressions?

Consider having to compute some value using an operation that might not be defined for certain values, like e.g. the tangent function. To avoid raising exceptions, I tried using pgfmath's ...
8
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2answers
138 views

tikz node name and calculation

I can't find out why the following code : \documentclass[border=0mm]{standalone} \usepackage{tikz} \usetikzlibrary{positioning,shapes.multipart, fit,backgrounds,calc} \begin{document} ...
6
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1answer
264 views

Place node at local maxima or minima of graph

Though there is an upvoted answer - the question is NOT answered. It turned out, that without smooth the resulting figure gets produced and looks alright, but the error remains. How to get rid of ...
4
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0answers
114 views

Calculate x-coordinate for given y-value by interpolating data from pgfplotstable

I have a text file data.txt with the following content: -2 -2 +1 +0 +1 +3 +2 +4 +2 I read it with \pgfplotstableread{data.txt}\data and then plot the second column by the first column with ...
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1answer
56 views

siunitx produces number too big error with large numbers

minimal (non)-working example: \documentclass{article} \usepackage{siunitx} \usepackage{pgfplotstable} \usepackage{filecontents} \pgfplotstableset{ header=true, trim cells=true, col sep=comma, ...
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1answer
362 views

Multiple \pgfmathparse and \pgfmathresult

Is it possible to use more than one \pgfmathparse and pgfmathresult in a single macro? In this MWE, I try to use two of each. It did not quite work. The fraction on top should say 10/3, not 0.3/3. ...
3
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1answer
115 views

Tikz inside a proof and enumerate environment

I am having a problem getting a tikz graph to correctly sit below the a) part of the problem in the solution: My code is as follows: \documentclass[12pt,leqno]{article} \usepackage{amsmath, amsfonts, ...
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2answers
109 views

How to multiply string?

\usepackage{tikz} \usepackage{xstring} \begin{document} \newcommand{\nG}[3]{ \node[opacity = 0, text opacity = 1, minimum size = 10mm] at (#1, #2){#3}; } \newcommand{\writeSep}[4]{ \foreach \x in ...
2
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1answer
67 views

Pgfmath misbehaving when reading negative values from table in Pgfplots

I am astonished that when I attempt to square a number read from a table with pgfplots, the result has the same sign. Consider this: \documentclass{standalone} \usepackage{pgfplots} ...
3
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2answers
184 views

`Missing = inserted for \ifnum` when using addplot

I'm trying to plot a normalized sinc function with PGFPlots/TikZ. As this is somewhat tricky because of the limiting value at 0, I used a suggestion provided by percusse. Here's a minimal example ...
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0answers
71 views

How to plot a function without functional equation (mu-sigma-space/portfoliotheory)

I was wondering if there is a easy way (some native function) for interpolation of points, i.e. to connect some few given points by a curve (approximation of a function). I have some concrete formulas ...
4
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1answer
158 views

pgfmath and doing some simple calculations using a variable

I'm creating addition worksheets for little oompa loompas. It works using: \documentclass{article} \usepackage{geometry} \geometry{letterpaper, portrait, margin=1.5cm, tmargin=2.5cm } ...
6
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1answer
103 views

Plotting piecewise function using declare function

I am trying to plot a piecewise defined function, but somehow I don't manage to get it right. See below. I use the following code \begin{tikzpicture}[ declare function={ func(\x)=(\x >8/10) * ...
6
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1answer
205 views

How to calculate geometric functions of tikz coordinates?

I have two points in tikz (m1 and m4) and would like to calculate the angle of the line defined by these two points and the horizontal line. The math would be atan( (x2-x1) / (y2-y2) ), and I tried ...
3
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1answer
142 views

Runaway argument using int() function in pgfplots

The MWE below yields Runaway argument? 3\pgfflt@EOI \ifpgfmathfloatparsenumberpendingperiod \pgfmathfloat@a@Mtok \ETC. ./TeX-SE.tex:29: Paragraph ended before \pgfflt@readlowlevelfloat was complete. ...
3
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1answer
190 views

List of strings for tikzpicture

at first my MWE: \documentclass{article} \usepackage{tikz} \begin{document} \def\johnlist{{ala},{bla},{cla}} % \def\johnlist{2,3,5,7} %This instead of the line above works... \begin{tikzpicture} ...
1
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1answer
67 views

how to save and reuse values between two tikz pictures

I have two pictures in the first, I calculate the angle of a vector, I wish reuse this value in the second figure. How can I save this value from one figure to another. The first picture ...
4
votes
1answer
78 views

pgfpositionnodelater with nested \tikz environments (Issue with PGF 2.1 -> 3.0 upgrade)

I'm trying to use \pgfpositionnodelater to create and measure nodes before placing them. (Their size influences where they should be placed) This works fine until I try to use \pgfpositionnode later ...
4
votes
1answer
79 views

\edef\x trick and pgfmath

With the MWE below, I find the following trouble: within the figure* environment, I have three different \lstset instructions. The first and 3rd (commented out) work, the 2nd (as is) presents with ...
4
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1answer
123 views

Using every edge style to thick causes problems with pgfmathparse Mod

When using every edge/.append style = {thick}, Mod doesn't work as intended. Not sure, if the problem is what I am infering or is something else. For example, consider \documentclass{beamer} ...
0
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1answer
84 views

PGF Math error with blank node in forrest [duplicate]

\documentclass[12pt]{article} \usepackage{forest} \usepackage{gb4e,cgloss} \forestset{ sn edges/.style={for tree={parent anchor=south, child anchor=north,align=center,base=bottom{}}}, ...
4
votes
1answer
78 views

Multiple uses of pgfpositionnodelater

I'm trying to generate and measure multiple nodes before placing them. Currently I'm using the following macros: % some helper / wrapper commands around \pgfplacenodelater % #1 = identifier for ...
5
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2answers
457 views

Need to plot a function in coordinate system

I would like to plot a rational function in LaTeX. I tried different ways with Tikz or pgfplots... nothing works. There are many different ways. Often there are problems with poles / asymptotes etc. ...
0
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1answer
48 views

Typeset pgfmath number in text mode

Some of the figures I make with pgfplots use pgfmath to calculate the tick positions for the extrema of a function, with code similar to the one given here. However, these numbers seem to always be ...
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0answers
49 views

downgrade pgfmath

This is the first time I do not receive any answers to my problem with pgfmath, and I would like to proceed, so I ask whether and how I can downgrade it? tikz/pgf upgrade and decorations As I ...
4
votes
1answer
52 views

TikZ: Move points towards center

I want to move a set of points towards the center of my figure, but I want the distance to depend inversely on the relative distance to the center. Thus, for instance move a point at (-2,-3) to ( -2 - ...
4
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2answers
111 views

Using the macro generated by \pgfmathprintnumberto in a \pgfmathparse or \SI

To demonstrate, here's a MWE: \documentclass[a4paper,titlepage]{article} \usepackage{pgf} \usepackage{siunitx} \begin{document} \pgfmathparse{1 + 1} ...
8
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1answer
462 views

Declaring sinc in tikz

I am trying to declare the sinc-function for usage in tikz. I tried two different ways: \documentclass{standalone} \usepackage{tikz} \usetikzlibrary{math} \begin{document} \begin{tikzpicture} ...
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0answers
97 views

Macro passing problem with pgfmath

As a continuation of thread 2010/2014 versions difference: I am trying to decorate program listings with highlighted lines, numbered balls, etc. In 2010, I used a macro which does not work any more ...