rsindex

Relative Strength Index (RSI)

Syntax

rsi = rsindex(closep, nperiods)
rsits = rsindex(tsobj, nperiods)
rsits = rsindex(tsobj, nperiods, ParameterName, ParameterValue)

Arguments

closep

Vector of closing prices.

nperiods

(Optional) Number of periods. Default = 14.

tsobj

Financial time series object.

Description

rsi = rsindex(closep, nperiods) calculates the Relative Strength Index (RSI) from the closing price vector closep.

rsits = rsindex(tsobj, nperiods) calculates the RSI from the closing price series in the financial time series object tsobj. The object tsobj must contain at least the series Close, representing the closing prices. The output rsits is a financial time series object whose dates are the same as tsobj and whose data series name is RSI.

rsits = rsindex(tsobj, nperiods, ParameterName, ParameterValue) accepts a parameter name/parameter value pair as input. This pair specifies the name for the required data series if it is different from the expected default name. The valid parameter name is

CloseName: closing prices series name

The parameter value is the string that represents the valid parameter name.

  1. The relative strength factor is calculated by dividing the average of the gains by the average of the losses within a specified time period:
    RS = (average gains)/(average losses).

  2. The first value of RSI, RISI(1), is set as NaN to preserve the dimensions of CLOSEP.

Examples

expand all

Calculate the Relative Strength Index (RSI)

This example shows how to calculate the RSI for Disney stock and plot the results.

load disney.mat
dis_RSI = rsindex(dis);
plot(dis_RSI)
title('Relative Strength Index for Disney')

References

Murphy, John J., Technical Analysis of the Futures Market, New York Institute of Finance, 1986, pp. 295-302.

Was this topic helpful?