alexmstahl

multislider in scroll mode is a very convenient tool for validating data streams from controllers and sensors. I have used it for many years. Recently I have been working on a packetized biometric sensor network system and noticed something that surprised me. In this simplified demo patch, I am sending a data stream to two multislders, both configured identically. The only difference is that the data to the multislider on the left has been grouped into a list, then iterated. The print statements show that (timing aside) the two multislders are receiving similar values. But the one on the left only displays (about) one value per list event.

The group/iter is in this demo a conceit to simulate what I have been seeing when displaying incoming OSC messages comprised of lists of n data samples. I have played with everything I can think of: defers, pipes, scheduler settings, etc.... to try and understand what is happening and find a way to graph every data point. My hardware is fast enough, and the sensor sample rates slow enough, that it works fine if the packet size is 1. But iterating any size list into the multislider, it seems to drop values.

If there is another object that might work better for this (it's not a scope, it's a value history) I would use that, but I am not aware of one. Also it is just bugging me now, I've been doing this kind of thing for decades, what gives?

multislider-test.maxpat

multislider in scroll mode is a very convenient tool for validating data streams from controllers and sensors. I have used it for many years. Recently I have been working on a packetized biometric sensor network system and noticed something that surprised me. In this simplified demo patch, I am sending a data stream to two multislders, both configured identically. The only difference is that the data to the multislider on the left has been grouped into a list, then iterated. The print statements show that (timing aside) the two multislders are receiving similar values. But the one on the left only displays (about) one value per list event. 

If there is another object that might work better for this (it's not a scope, it's a value history) I would use that, but I am not aware of one. Also it is just bugging me now, I've been doing this kind of thing for decades, what gives?


multislider in scroll mode is a very convenient tool for validating data streams from controllers and sensors. I have used it for many years

scrolling-multislider-issue

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i saw that on fb and almost replied but i wasnt so sure; my guess would have been that it is simply a drawing issue.

and when you think about it, the "normal" application of a scrolling slider display is not to send it successive values, but a constant stream (because it does not make much sense to display a delta time of 0.0 ms on a horizontal axis.)


i saw that on fb and almost replied but i wasnt so sure; my guess would have been that it is simply a drawing issue.

and when you think about it, the "normal" application of a scrolling slider display is not to send it successive values, but a constant stream (because it does not make much sense to display a delta time of 0.0 ms on a horizontal axis.)


scrolling multislider issue