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Expression Syntax For Generic Applets
Expression syntax are used to describe mathematical operations, functions and conditions in applets.
Expression for math functions
In the generic framework expressions are used to describe the value of a number or function variables.
| Category |
Syntax |
Examples |
| Numbers |
0-9 |
1+2 |
| $\pi$ |
pi |
pi/2 |
| Parantheses |
() |
(-x+1)*(x+2) |
| Standard Operations |
+,-,/,*,^ |
1+2, pi/2 |
| Absolute value |
abs(arg) or |arg| |
abs(x), |
| Trigonometric functions |
sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, asinh, acosh, atanh |
sin(2*pi), (cos(x))^2 |
| Signum |
sign(arg) |
sign(x+2) |
| Theta |
theta(arg) |
theta(x) |
| Dirac delta function (1 for x = 0, 0 otherwise) |
dirac(arg) |
dirac(x) |
| Exponential function |
exp(x) or e^x |
exp(2*x) |
Expression for conditions
This is used to described conditions, such as in \randadjustif or in generic visualization's \IFELSE command
It is basically a relation between the values of two Operations or function from the 1st category
| Category |
Syntax |
Examples |
Note |
| Equal |
left=right |
x=0, x=y, |(x)|=1 |
is true if the value of the left side equals the value of the right side |
| Not equal |
left!=right |
x!=0, x!=y |
|
| Greater than |
left>right |
x > y |
|
| Less than |
left < right |
x < y |
|
| Greater than or equal |
left >=right |
x >= y |
|
| Less than or equal |
left <=right |
x <= y, abs(x)<3, sin(x)<0.5 |
|
| Grouping brackets |
[left>=right] |
[abs(x)>3] AND [abs(x)<5] |
use to group a relation |
| Negation |
NOT [left > right] |
NOT [x = y] |
negate the relation in the brackets, returns true if x != y |
| AND |
[cond1] AND [cond2] |
[x>0] AND [x<3] |
|
| OR |
[cond1] OR [cond2] |
[x<0] OR [x>3] |
Special syntax in a generic visualization: var()
In a generic visualization, var(arg) can be used in operations or conditions and it will be replaced by the value of the variable with the name arg. Remember to write var as a function var(x) and not as a Tex-command \var{x}.
1 2 3 4 5 | \begin{variables}
\randint{x}{-5}{5} %create two random integers
\randint{y}{-5}{5}
\point{p1}{real}{var(x),var(y)} %creates a point on (x,y) depending on the values of x and y.
\end{variables}
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