소셜 수학: socialmathnet.com

Interactive Math Programs   http://www.dartmouth.edu/~rewn/javaindex.html 

벡터장 그리기 http://www.dartmouth.edu/~rewn/vector.html

The equation parser used for these Java applets is a very robust recursive descent equation parser. It has complete error handling and is very difficult to crash. Here is a list of features and supported operations:

• Full understanding of standard order-of-operations
• Supports exponentiation using the ‘^’ symbol
• Implicit multiplication between a variable and a number and between parenthesised tokens
• List of supported operations:
  • +,-,*,/,^
  • sin(x), cos(x), tan(x), acos(x), asin(x), atan(x)
    – Assumes x is in radians
  • abs(x) – Returns the absolute value of x
  • exp(x) – Returns e^x
  • ln(x) – Returns the natural logarithm of x
  • sqrt(x) – Returns the square root of x
  • he(x) – Returns 0 if x<0 and 1 if x>=0