Calculate the simple moving average of the preceding K items. Naive Approach: Two nested loops are used in this. The array is traversed from left to right in the outer loop. For each index, the inner loop computes the average of the previous K elements, including itself.
The moving average values are finally printed. The traversal of the outer loop begins at index K. Hi Marc, I was after a function for a moving average in C and came across this article. Looking at this and other articles it appears that you need memory for a "history" of samples to calculate the moving average over.
All I was interested in was a simple way of filtering real time data to display a trend on a graph without the requirement for an array of data. The proportion acts in a similar way to the window size - the bigger the window the smoother the average. And it only requires one variable making it ideal for DSP. Hi I want to smooth my real time plot for audio input. Is there any c solution? Thanks for any comment. Re: real time moving avarage CatchExAs Jul See some of my articles on the subject and I am sure you will find inspiration.
Re: real time moving avarage alijahan Jul Hi Thank you very much and excuse me for late reply. Love it! Nicolas Hoppe. Thanks for sharing this great work Marc! Easy Moving Average penguinman 5-Dec I implement a moving average in embedded code without an array, or much calculation at all: With one line of code. Infact I use this in C and java as well, no arrays or collections needed. Am I missing something? Interesting - it seems like it would not track exactly with a moving average that pops off the oldest value, but I'd have to compare the two.
Very simple alternative Member 1-Oct Member Just tried this and all works well but struck me as a lot of code for a fairly simple problem. How about this very simple alternative. Dequeue ; s. Enqueue x ; return s. Steve Hayles. Re: Very simple alternative UserMarcus Feb Very nice and handy. Thank you! Good job mwpowellhtx 7-Sep Couldn't agree with you more Marc. I've been around the industry long enough to tell the difference between sloppy, careless, lack-of-attention-to-detail, difference between "we don't have time for it, just get 'er done" type mentality, versus, "no sir, you don't not have time for it" for the reasons you outlined.
Talk the issue through, make sure you've got the best possible approach there, and we can refactor it later. As long as it's SOLID which I am also an advocate for , it should be simple and transparent to do so should a better solution present itself. Cheers, Michael Powell. My vote of 5 Ruifeng Zhang 3-Sep Ruifeng Zhang. Thank you very much, That is what I need exactly!!!! My vote of 5 Manoj Kumar Choubey 2-Mar Manoj Kumar Choubey. Drop respirator 1-Apr Very often we need to calculate a moving average with a latency as rule an average in the middle of a moving window.
Thus, you are writing out of bounds, which is likely to cause a crash later on. Running your program under Valgrind or a similar memory checker will point out this issue, as well as the memory leak pointed out in the other answer.
You need to free that memory when you no longer need it. Also, you should add a null-check to the value returned from malloc , to detect when allocation fails.
Otherwise, you'll invoke Undefined Behavior when deallocating the null pointer. The original code cleaned up to actually compile and work correctly.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. C programming : Moving average filter Ask Question. Asked 1 year, 6 months ago. Sorin Sorin 11 2 2 bronze badges. This looks similar to what TA-Lib is doing. Seems optimal. This is MA I'm using in my app.
Miroslav Popov Miroslav Popov 2, 1 1 gold badge 29 29 silver badges 50 50 bronze badges. Here's how I tried it. But warning I'm a complete amateur so this may be completely wrong. Add interval. Mahalo Quaker Mahalo Quaker 11 2 2 bronze badges. How about Queue? Generic; using System. WriteLine ma. Skip k. Take period. Arthur Zennig Arthur Zennig 1, 19 19 silver badges 16 16 bronze badges. My MovingAverage class implementation is: Thread safe Lock free limited to windowSize that is power of two Here is the class: using System; using System.
Linq; using System. DefaultIfEmpty 0. That sut. ComputeAverage , Is. EqualTo 0 ; sut. Add 2 ; Assert. EqualTo 2 ; sut. Add 4 ; Assert. EqualTo 3 ; sut. Add 0 ; Assert. Add 6 ; Assert. EqualTo 4 ; sut. Add 0 ; sut. Add 10 ; sut. Add 10 ; Assert. Gian Marco Gian Marco
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