MATLAB: Unsure of which block to use in simulink to keep running total.

cumulative sumDSP System Toolboxrunning totalsimulinksum of elements

I am building a model in simulink and need to keep a running total of a variable. i.e. if at each time step the value going into the block is 1 3 0 5 then I want the output to be 1 4 4 9. I am unsure if the "sum of elements" block can do this or if I need a "cumulative sum" block from the DSP system toolbox. Any help would be great and if I have missed any important information then I would be happy to clarify.
Roger

Best Answer

If you are using a fixed-step discrete solver, then probably a Discrete-Time Integrator block should do the trick. If you are using a variable-step continuous solver, and your variable varies continuously with time (as opposed to discretely), then an Integrator block is more appropriate.
HTH,
Arnaud
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