abs

Syntax

abs(X)

Parameters

X is a scalar/pair/vector/matrix/dictionary/table.

Details

Return the element-by-element absolute value(s) of X.

The abs function in DolphinDB has the same functionality as the abs functions in Python, NumPy, and scipy.stats

, with the following difference: Python/NumPy/scipy.stats support calculating the absolute value of complex numbers,whereas DolphinDB’s abs function does not support complex numbers. To calculate the absolute value of complex numbers in DolphinDB, you can use the abs function provided in the DolphinDB signal plugin (see example).

Examples

abs(-2.0);
// output: 2

abs(-2 -3 4);
// output: [2, 3, 4]

Calculate the absolute value of a complex number using the signal plugin.

// Check whether the signal plugin exists in the plugin marketplace
listRemotePlugins()

// Download the signal plugin from the marketplace
installPlugin("signal")

// Load the signal plugin
loadPlugin("signal")

// Create a complex number
z = complex(3, 4)  // 3.0+4.0i

// Calculate the absolute value of the complex number
abs = signal::abs(z)

abs
// output: 5