Graphics Program For Engineers

[cocoengin]

Hi all, i need a good equiped graphics program for engineers. i want to make graphics for my calculations, functions, logic graphics, and thigs like that an electronics engineer need. i know about Matlab, but i dont want to use it , i need a program that only makes graphics...
 
Thank you for all

[osama]

you can use RFFlow it's a nice program to draw your circuits its available enywhere just search with google , or you can use visio from microsoft but it will take about 200M on the hard