pyxplot: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/pyxplot - from package: pyxplot

You may install the required package with command apt-get install {package}

Error in other languages:
pyxplot: bevel nie gevind nie
pyxplot: comandă negăsită
pyxplot: comando não encontrado
pyxplot: commande introuvable
pyxplot: command not found
pyxplot: käsku ei ole
pyxplot: không tìm thấy lệnh
pyxplot: komanda nerasta
pyxplot: Kommando nicht gefunden.
pyxplot: kommandot finns inte
pyxplot: komut yok
pyxplot: nie znaleziono polecenia
pyxplot: níor aimsíodh an t-ordú
pyxplot: no se encontró la orden
pyxplot: no s'ha trobat l'ordre
pyxplot: opdracht niet gevonden
pyxplot: parancs nem található
pyxplot: perintah tidak ditemukan
pyxplot: príkaz nenájdený
pyxplot: příkaz nenalezen
pyxplot: команда не найдена
pyxplot: командата не е открита
pyxplot: 命令找不到
pyxplot: コマンドが見つかりません