qtgrace: add page

pages/linux/qtgrace.md

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+# qtgrace
+
+> Display, plot, analyze 2D data.
+> A Qt reimplementation of Grace (https://plasma-gate.weizmann.ac.il/Grace/), sharing its command-line interface.
+> More information: <https://sourceforge.net/projects/qtgrace/>.
+
+- Get more information on command-line arguments (press q to quit) :
+
+`qtgrade -help | less`
+
+- Plot one or more data files, plotting only the first two colums in each file as X Y :
+
+`qtgrace {{path/to/file1.dat path/to/file2.dat ...}}`
+
+- Plot one or more data files, plotting all columns in each file as X Y1 Y2 ... :
+
+`qtgrace {{-nxy path/to/file1.dat -nxy path/to/file2.dat ...}}`
+
+- Plot one or more data files with a logarithmically scaled x-axis :
+
+`qtgrace -log x {{file1.dat file2.dat ...}}`
+
+- Plot a data file with a logarithmic scale on both axes, with data formatted as X Y DY :
+
+`qtgrace -log xy -settype xydy {{file.dat}}`