Root finding using Newton's method (eg. x^2 = 64). Note: estimation and limited to one root
Derivation (prime notation) and integration (eg. integral(a, b, x dx)
The value of an integral is estimated using Simpson's 3/8 rule,
while derivatives are estimated using the symmetric difference quotinent (and derivatives of higher
order can be a bit inaccurate as of now)
Piecewise functions: f(x) = { f(x + 1) if x <= 1; x otherwise }, pressing enter before
typing the final "}" will make a new line without submitting. Semicolons are only needed when
writing everything on the same line
Different number bases: Either with a format like 0b1101, 0o5.3,
0xff
or a format like 1101_2. The latter does not support letters, as they would
be interpreted as variables.
The base command is used to set the display base. For example, writing
base 16 results in output being displayed in the hexadecimal number base,
as well as decimal.
You can type special symbols (such as √) by typing the normal function or constant name and pressing tab.
* becomes ×
/ becomes ÷
and becomes ∧
not becomes ¬
or becomes ∨
[[ becomes ⟦⟧
_123 becomes ₁₂₃
asin, acos, etc. become sin⁻¹(), cos⁻¹(), etc
sqrt becomes √
deg becomes °
pi becomes π
sum becomes Σ()
prod becomes ∏()
integrate becomes ∫()
tau becomes τ
phi becomes ϕ
floor becomes ⌊⌋
ceil becomes ⌈⌉
gamma becomes Γ
( becomes ()
Variables
Variables are defined with the following syntax: name = value
Examples: x = 3/4
Functions
Functions are defined with the following syntax: name(param1, param2, etc.) = value
Examples: f(x) = 2x+3A(x, y) = (xy)/2
They are used like this: name(arg1, arg2, etc.)
Examples: f(3) + 3A(2, 3)
Derivation can be done like this: name'(arg1)
Examples: f'(3) + 3sin'(pi)
Predefined functions
sin, cos, tan, cot, cosec,
sec
sinh, cosh, tanh, coth, cosech,
sech
asin, acos, atan, acot, acosec,
asec
ashin, acosh, atanh, acoth,
acosech, asech
abs, ceil or ⌈⌉, floor or ⌊⌋,
frac,
round, trunc
sqrt or √, cbrt, exp, log,
ln, arg, Re, Im
gamma or Γ
asinh, acosh, atanh, acoth,
acosech, asech
bitcmp, bitand, bitor, bitxor,
bitshift
comb or nCr, perm or nPr
gcd, lcm
min, max, hypot
log - eg. log(1000, 10) is the same as log10(1000)
root - eg. root(16, 3) is the same as 3√16
average, perms, sort
transpose
matrix - takes a vector of vectors and returns a matrix
integrate - eg. integrate(0, pi, sin(x) dx) is the same as
sum - eg. sum(n=1, 4, 2n) is the same as
Constants
pi or π = 3.14159265
e = 2.71828182
tau or τ = 6.2831853
phi or ϕ = 1.61803398
Vectors
A vector in kalker is an immutable list of values, defined with the syntax
(x, y, z) which may contain an arbitrary amount of items. Generally,
when an operation is performed on a vector, it is done on each individual item.
This means that (2, 4, 8) / 2 gives the result (1, 2, 4).
An exception to this is multiplication with two vectors, for which the result is
the dot product of the vectors. When a vector is given to a regular function,
the function is applied to all of the items in the vector.
Indexing
A specific item can be retrieved from a vector using an indexer, with the
syntax vector[[index]]. Indexes start at 1.
Vector comprehensionsexperimental
Vectors can be created dynamically using vector comprehension notation,
which is similar to set-builder notation. The following example creates
a vector containing the square of every number between one and nine except five:
[n^2 : 0 < n < 10 and n != 5]. A comprehension consists of
two parts. The first part defines what should be done to each number,
while the second part defines the numbers which should be handled in
the first part. At the moment, it is mandatory to begin the
second part with a range of the format a < n < b where n
defines the variable which should be used in the comprehension.
Several of these variables can be created by separating the conditions
by a comma, for example [ab : 0 < a < 5, 0 < b < 5].
Matrices
A matrix is an immutable two-dimensional list of values, defined with the syntax
[x, y, z; a, b, c] where semicolons are used to separate rows and
commas are used to separate items. It is also possible to press the enter key
to create a new row, instead of writing a semicolon. Pressing enter will not
submit if there is no closing square bracket. Operations on matrices work the
same way as with vectors, except that two matrices multiplied result in matrix
multiplication. It is also possible to obtain the tranpose of a matrix with the
syntax A^T, where A is a matrix and T is
a literal T.
Indexing
A specific item can be retrieved from a matrix using an indexer, with the
syntax matrix[[rowIndex, columnIndex]]. Indexes start at 1.
Files
Kalker looks for kalker files in the system config directory.
Linux: ~/.config/kalker/
macOS: ~/Library/Application Support/kalker/ or
~/Library/Preferences/kalker
Windows: %appdata%/kalker/
If a file with the name default.kalker is found, it will
be loaded automatically every time kalker starts. Any other files in
this directory with the .kalker extension can be loaded
at any time by doing load filename in kalker. Note that
the extension should not be included here.
Download
kalker officially runs on Linux, Windows, macOS, and Android.