Modify the ignore list.

.gitignore

 
-# Created by https://www.gitignore.io/api/matlab,linux
+# Created by https://www.gitignore.io/api/latex
+
+### LaTeX ###
+## Core latex/pdflatex auxiliary files:
+*.aux
+*.lof
+*.log
+*.lot
+*.fls
+*.out
+*.toc
+*.fmt
+*.fot
+*.cb
+*.cb2
+
+## Intermediate documents:
+*.dvi
+*.xdv
+*-converted-to.*
+# these rules might exclude image files for figures etc.
+# *.ps
+# *.eps
+# *.pdf
+
+## Generated if empty string is given at "Please type another file name for output:"
+.pdf
+
+## Bibliography auxiliary files (bibtex/biblatex/biber):
+*.bbl
+*.bcf
+*.blg
+*-blx.aux
+*-blx.bib
+*.run.xml
+
+## Build tool auxiliary files:
+*.fdb_latexmk
+*.synctex
+*.synctex(busy)
+*.synctex.gz
+*.synctex.gz(busy)
+*.pdfsync
+*Notes.bib
+
+## Auxiliary and intermediate files from other packages:
+# algorithms
+*.alg
+*.loa
+
+# achemso
+acs-*.bib
+
+# amsthm
+*.thm
+
+# beamer
+*.nav
+*.pre
+*.snm
+*.vrb
+
+# changes
+*.soc
+
+# cprotect
+*.cpt
+
+# elsarticle (documentclass of Elsevier journals)
+*.spl
+
+# endnotes
+*.ent
+
+# fixme
+*.lox
+
+# feynmf/feynmp
+*.mf
+*.mp
+*.t[1-9]
+*.t[1-9][0-9]
+*.tfm
+
+#(r)(e)ledmac/(r)(e)ledpar
+*.end
+*.?end
+*.[1-9]
+*.[1-9][0-9]
+*.[1-9][0-9][0-9]
+*.[1-9]R
+*.[1-9][0-9]R
+*.[1-9][0-9][0-9]R
+*.eledsec[1-9]
+*.eledsec[1-9]R
+*.eledsec[1-9][0-9]
+*.eledsec[1-9][0-9]R
+*.eledsec[1-9][0-9][0-9]
+*.eledsec[1-9][0-9][0-9]R
+
+# glossaries
+*.acn
+*.acr
+*.glg
+*.glo
+*.gls
+*.glsdefs
+
+# gnuplottex
+*-gnuplottex-*
+
+# gregoriotex
+*.gaux
+*.gtex
+
+# hyperref
+*.brf
+
+# knitr
+*-concordance.tex
+# TODO Comment the next line if you want to keep your tikz graphics files
+*.tikz
+*-tikzDictionary
+
+# listings
+*.lol
+
+# makeidx
+*.idx
+*.ilg
+*.ind
+*.ist
+
+# minitoc
+*.maf
+*.mlf
+*.mlt
+*.mtc[0-9]*
+*.slf[0-9]*
+*.slt[0-9]*
+*.stc[0-9]*
+
+# minted
+_minted*
+*.pyg
+
+# morewrites
+*.mw
+
+# nomencl
+*.nlo
+
+# pax
+*.pax
+
+# pdfpcnotes
+*.pdfpc
+
+# sagetex
+*.sagetex.sage
+*.sagetex.py
+*.sagetex.scmd
+
+# scrwfile
+*.wrt
+
+# sympy
+*.sout
+*.sympy
+sympy-plots-for-*.tex/
+
+# pdfcomment
+*.upa
+*.upb
+
+# pythontex
+*.pytxcode
+pythontex-files-*/
+
+# thmtools
+*.loe
+
+# TikZ & PGF
+*.dpth
+*.md5
+*.auxlock
+
+# todonotes
+*.tdo
+
+# easy-todo
+*.lod
 
-### Linux ###
-*~
+# xindy
+*.xdy
 
-# temporary files which can be created if a process still has a handle open of a deleted file
-.fuse_hidden*
+# xypic precompiled matrices
+*.xyc
 
-# KDE directory preferences
-.directory
+# endfloat
+*.ttt
+*.fff
 
-# Linux trash folder which might appear on any partition or disk
-.Trash-*
+# Latexian
+TSWLatexianTemp*
 
-# .nfs files are created when an open file is removed but is still being accessed
-.nfs*
+## Editors:
+# WinEdt
+*.bak
+*.sav
 
-### Matlab ###
-# Windows default autosave extension
-*.asv
+# Texpad
+.texpadtmp
 
-# OSX / *nix default autosave extension
-*.m~
+# Kile
+*.backup
 
-# Compiled MEX binaries (all platforms)
-*.mex*
+# KBibTeX
+*~[0-9]*
 
-# Packaged app and toolbox files
-*.mlappinstall
-*.mltbx
+# auto folder when using emacs and auctex
+/auto/*
 
-# Generated helpsearch folders
-helpsearch*/
+# expex forward references with \gathertags
+*-tags.tex
 
-# Simulink code generation folders
-slprj/
-sccprj/
 
-# Matlab code generation folders
-codegen/
-
-# Simulink autosave extension
-*.autosave
-
-# Octave session info
-octave-workspace
-
-
-# End of https://www.gitignore.io/api/matlab,linux
-results/
-input_data/
+# End of https://www.gitignore.io/api/latex
+variational.pdf