Arithmetic: Difference between revisions
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Available operations: | Available operations: | ||
<pre> | <pre> | ||
add : Adds const. xij = xij+const | |||
subtract : Subtract const. xij = xij-const | |||
multiply : Multiply by const. xij = xij*const | |||
divide : Divide by const. xij = xij/const | |||
inverse : Invert and multiply by const. xij = const/xij | |||
power : Raise to power of const. xij = xij^const | |||
root : Take const root. xij = xij^(1/const) | |||
modulus : Modulus after division by const. xij = mod(xij,const) | |||
round : Round to nearest 1/const fraction. xij = round(xij*const)/const | |||
log : Log to base const. xij = log(xij)/log(const) | |||
antilog : Antilog to base const. xij = const^(xij) | |||
noop : Identity op. Make no change. xij = xij | |||
</pre> | </pre> | ||
====Inputs==== | ====Inputs==== | ||
Latest revision as of 12:50, 17 April 2013
Purpose
Apply simple arithmetic operations to all or part of dataset.
Synopsis
- [cx] = arithmetic(x);
- [cx] = arithmetic(x, op, const);
- [cx] = arithmetic(x, op, const, indices);
- [cx] = arithmetic(x, op, const, indices, modes);
Description
Apply an arithmetic operation to the input dataset or array (n-way), or a specified subset thereof. The supported operations are listed below. These are applied element-wise, so 'multiply' is applied as '.*' for example. The operation is applied to x or the specified subset of x.
Available operations:
add : Adds const. xij = xij+const subtract : Subtract const. xij = xij-const multiply : Multiply by const. xij = xij*const divide : Divide by const. xij = xij/const inverse : Invert and multiply by const. xij = const/xij power : Raise to power of const. xij = xij^const root : Take const root. xij = xij^(1/const) modulus : Modulus after division by const. xij = mod(xij,const) round : Round to nearest 1/const fraction. xij = round(xij*const)/const log : Log to base const. xij = log(xij)/log(const) antilog : Antilog to base const. xij = const^(xij) noop : Identity op. Make no change. xij = xij
Inputs
- x = dataset or array.
Optional Inputs
- operation = name (char) of arithmetic operation to apply.
- const = value (double) used in the operation.
- indices = a cell of requested indices (e.g. {[1:5] [10:20]} ).
- modes = Modes (integer, or vector) to which indicies should be applied. See nindex/nassign for indices and modes usage.
Outputs
- cx = modified dataset or array.
Options
options = a structure array with the following fields:
- isundo: [ 'yes' | {'no'} ] Change operation to undo mode.