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dsp.CumulativeSum System object

Cumulative sum of channel, column, or row elements


The CumulativeSum object computes the cumulative sum of channel, column, or row elements.

To compute the cumulative sum of channel, column, or row elements:

  1. Define and set up your cumulative sum object. See Construction.

  2. Call step to compute the cumulative sum according to the properties of dsp.CumulativeSum. The behavior of step is specific to each object in the toolbox.


Starting in R2016b, instead of using the step method to perform the operation defined by the System object™, you can call the object with arguments, as if it were a function. For example, y = step(obj,x) and y = obj(x) perform equivalent operations.


csum = dsp.CumulativeSum returns a cumulative sum System object, csum, which computes the running cumulative sum for each channel in the input.

csum = dsp.CumulativeSum('PropertyName',PropertyValue,...) returns a cumulative sum object, csum, with each specified property set to the specified value.



Computation dimension for cumulative sum

Specify the computation dimension as one of | Channels (running sum) | Rows | Columns |. The default is Channels (running sum).


Enable resetting cumulative sum via input port.

Set this property to true to enable resetting the cumulative sum. When you set this property to true, you also specify a reset input to the step method to reset the cumulative sum. The default is false.


Reset condition for cumulative sum

Specify the event on the reset input port that resets the cumulative sum as one of | Rising edge | Falling edge | Either edge | Non-zero |. This property applies when you set the ResetInputPort property to true. The default is Rising edge.

 Fixed-Point Properties


resetReset internal states of cumulative sum object to zero
stepCumulative sum along specified dimension for input
Common to All System Objects

Create System object with same property values


Expected number of inputs to a System object


Expected number of outputs of a System object


Check locked states of a System object (logical)


Allow System object property value changes


expand all

Note: This example runs only in R2016b or later. If you are using an earlier release, replace each call to the function with the equivalent step syntax. For example, myObject(x) becomes step(myObject,x).

Use the dsp.CumulativeSum object to compute the cumulative sum of a matrix.

 csum = dsp.CumulativeSum;
 x = magic(2)
x = 

     1     3
     4     2

 y = csum(x)
y = 

     1     3
     5     5

The cumulative sum is computed column-wise along each channel.


This object implements the algorithm, inputs, and outputs described on the Cumulative Sum block reference page. The object properties correspond to the block properties, except:

The Reset port block parameter corresponds to both the ResetCondition and the ResetInputPort object properties

Extended Capabilities

Introduced in R2012a

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