+ + + =

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Content

1. Introduction
2. Getting Help
3. Rules
4. How to use?
5. Computing
6. Document

Introduction

Getting Help

1. It has extensive built-in documentation, accessible by typing a math function or a function name or a keyword, followed by a question mark? e.g.
   • or click the button. e.g.

2. AI chat GPT followed by double question mark?? e.g.

   • or click the button. e.g.

3. Show usage by starting with help

4. Show source code by starting with code

Rules

put function arguments in parentheses: sin(x) -- correct, sin x -- incorrect; do not omit multiplication: x*sin(x) -- correct, x sin(x) -- incorrect. Usual keywords are lowercase, which are different from uppercase, e.g. sin is different from Sin. Its default variable is small letter x, but its default index variable in discrete math is k.

By default, the unknown function is y(x) and its initial value is y(0)=0.
For ordinary differential equation, an independent variable is x.
For a partial differential equation, the unknown function is y(1,x) and y(1,t) with its two independent variables x and t.
For a system of equations, two unknown functions are x(t) and y(t) with an independent variable t.

There are 6 way to input derivative of y: y(1,x), ds(y,x), d(y(x),x), ds(y), d(y(x)), y'
There are 3 way to input second order derivative of y: y(2,x), ds(y,x,2), d(y(x),x,2)
There are 3 way to input the 0.5 order derivativeof y: y(0.5,x), ds(y,x,0.5), d(y(x),x,0.5)
There are 4 way to input the 0.5 order integral of y: y(-0.5,x), ds(y,x,-0.5), d(y(x),x,-0.5), ints(y,x,0.5)

more are in Differential equation and example.

How to use?

button	to do
	the ENTER Clear
	the ENTER key in your keybord to calculate symbolly.
	JavaScript numeric 数值计算
	help 帮助查看
	AI chat GPT

There are many ways :
1. Input or click sin(x) , click for integration, click button for derivative to check its result, click again for second derivative, click to inverse function, click for definition, click to simplify, click ......
2. Input the unkown y as seond argument,
   then click the button to solve for unknown y.
3. Input command by use of the first function as command :
   
   then hit the button or the ENTER key in your keybord.
   
4. Input function :
5. Input function by use of "," or ";" as separator for multistatements :
6. Input question mark ? to show index :
   
7. Input keyword and question mark ? to show its content :
   
8. Input function and question mark ? to show its function source :
   
9. Input function and the = mark to calculate numerically :
   
10. Input function, then hit the ≈ button to calculate numerically :
    
11. Input keyword and then click the question mark ? button to show its content :
    
12. Input function and then click the question mark ? button to show its function graph :
    
13. just click the question mark ? button to show index. i.e.
    

Computing