svm-toy-gtk: command not found

Have You tried accessing the binary with the full path?

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

[root@server ~]# echo $PATH

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 CentOS possible default full paths are:

/usr/bin/svm-toy-gtk - from package: libsvm-svm-toy-gtk

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