# Tagged Questions

{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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### How to Generate Random Negative Integer?

I am trying to create a worksheet constituted of random numbers so that kids can practice integer operations. E.g. 3+-9=? 2x(-5)=? 18/-3=? Etc. How do I do this? Here is what I've tried so far. ...
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### Parsing input for table automatically generated from csv file

I have a .csv file which looks like: {one},{two},{three} 11/07/2014,14:49:54,(100,100) 2,2,2 I have some code which creates a table from the .csv file. \documentclass{article} \usepackage{...
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### Tikz plot of a (log-) normal quantile function and inverse error function

I want to plot the lognormal and normal quantile functions in tikz. To fix notation, let's refer to https://en.wikipedia.org/wiki/Normal_distribution, which gives the quantile of the normal ...
315 views

### Precision in numeric calculations

When using pgfmathsetmacro with very small of high exponents, it doesn't work. The example below exits by complaining a division by zero. Is there any way to increase the precision that this works or ...
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### Computing minimum width based on style arg

I have successfully defined a "block" that I can instantiate in various sizes, with annotations at its sides. However, I would like to set the minimum width to sqrt(#2), while keeping the label as #2....
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I get output files from a code and I want to display the output file with pgfplots. I want to create several different plots with the same files. Therefore, I read them in a macro with pgfplotstable. ...
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when i create a table within the process of LaTeX, i am able to access the items, for example in a loop. If i read a table from a file with "\pgfplotstableread" then it refuses to read in values with ...
76 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 ...
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### 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 ...
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### 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 .....
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### 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, ...
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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. https://en.wikipedia.org/...
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### 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} \begin{...
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### 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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### 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 ...
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### 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: \usepackage[utf8]{...
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### 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 ...
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### 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} \...
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### 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 ...
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### 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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### 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 \...
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### 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 ...
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### 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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### 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 ...
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### 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} \pgfmathsetmacro{\varafterglowb}{ln(\...
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### 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 ...
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### \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: \documentclass{...
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### 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 ...
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### 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 ...
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### 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}{ \pgfmathsetmacro{\dest}{\src+...
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### 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.
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### 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 ...
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### 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 ifthenelse(&...
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### 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} \begin{...
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### 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 ...
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### 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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### 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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### 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. ...
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### 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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### 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 ...
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### 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} \usepackage{...
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### 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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### 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 ...
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### 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 } \...
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### 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) * (...
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### 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 ...
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### 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. &...
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### 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} \...