create_matrix: 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/create_matrix - from package: gasic

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

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