{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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4
votes
1answer
66 views

avoid logarithm of zero in pgfmathparse conditional assignment

How can i avoid the error message ! Package PGF Math Error: I cannot calculate the logarithm of '0' (in ' 0>1 ? ln(0) : 0'). in the following code? If possible, i want to evaluate the statement ...
1
vote
0answers
29 views

PGFmathprint fraction precision problem

I try to make this table using pgf number typesetting but have a precision problem. From the manual : If you still experience stability problems, use \usepackage{fp} in your preamble. The frac ...
2
votes
1answer
37 views

Undefined control sequence \pgfmath@ in \node with text height or text depth

The below file gives this error when compiled with pdflatex (from TeX Live 2015). How do I fix it, and what have I done wrong? Error \pgfmath@dimen@ ...men@@ #1=0.0pt\relax \pgfmath@ l.27 ...
3
votes
1answer
19 views

Misterious “dimension too large” error in pgfplot when using width

Look at the following MWE: \documentclass{standalone} \usepackage{tikz} \usepackage{pgfplots}\pgfplotsset{compat=1.9} \begin{document} \begin{tikzpicture}[] \begin{axis}[ width=14cm, ...
1
vote
0answers
22 views

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. ...
1
vote
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} ...
1
vote
0answers
72 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 ...
1
vote
0answers
20 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
votes
1answer
132 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
votes
3answers
274 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
votes
0answers
47 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
votes
0answers
51 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
votes
2answers
84 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} ...
1
vote
1answer
39 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
votes
4answers
307 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
votes
3answers
179 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 ...
2
votes
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
votes
2answers
132 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
votes
0answers
84 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
votes
1answer
203 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
votes
2answers
71 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
votes
0answers
76 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
votes
1answer
192 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
votes
1answer
68 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
votes
3answers
148 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
votes
1answer
102 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
votes
2answers
143 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
votes
1answer
270 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
votes
0answers
124 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 ...
1
vote
1answer
63 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, ...
5
votes
1answer
394 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
votes
1answer
120 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, ...
1
vote
2answers
110 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
votes
1answer
70 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
votes
2answers
201 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 ...
1
vote
0answers
72 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
votes
1answer
165 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
votes
1answer
105 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
votes
1answer
214 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
votes
1answer
151 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
votes
1answer
196 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
vote
1answer
71 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
votes
1answer
129 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
votes
1answer
90 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
votes
2answers
486 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
votes
1answer
52 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 ...
1
vote
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 ...