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Mar 25, 2021
11:47 PM

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Mar 25, 2021
11:47 PM

Best Smoothing Approach

Hi

Help with smoothing function please.

I am having issues formulation a smoothing function. Errors like "This value must be a vector of real numbers: pop up.

A working example will help a lot.

Prime 6 File Attached.

Solved! Go to Solution.

1 ACCEPTED SOLUTION

Accepted Solutions

Mar 28, 2021
05:51 PM

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Mar 28, 2021
05:51 PM

l having problems plotting.

Mathcad and Excel file attached for your help please.

- Tags:
- smoothing

12 REPLIES 12

Mar 26, 2021
01:40 AM

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Mar 26, 2021
01:40 AM

Your approach failed because i is not a vector but a range!

In the pic below I used an undocumented trick to turn a range into a vector by adding a numeric evaluation when defining the variable i. Furthermore I chose the first value to be 1 instead of zero so the magnitude of i and r.dom match.

But of course you are on the save side if you define the necessary vector the "legal" way:

A working example can also be found in the help

You may also be interested in the information about smoothing in the MC15 help. Find it converted to pdf in the attachments.

Mar 26, 2021
03:00 PM

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Mar 26, 2021
03:00 PM

Is it possible to integrate the supsmooth function?

Mar 26, 2021
03:48 PM

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Mar 26, 2021
03:48 PM

@DJF wrote:

Is it possible to integrate the supsmooth function?

supsmooth does not return a function but rather a vector of y-values corresponding to the vector of x-values provided.

You either can write your own "integration" function which works on datapoints given by vectors or you use interpolation (either linear or cubic splines) to turn the result of supsmooth into a function.

Mar 26, 2021
04:25 PM

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Mar 26, 2021
04:25 PM

A function for the supsmooth can be defined using the x and y vectors with interp function. This new function can be integrated.

Mar 26, 2021
05:13 PM

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Mar 26, 2021
05:13 PM

I see. So, then no real advantage to using supsmooth over say a b-spline (unless you happen to like the fit better). was hoping to save a step. Thanks all.

Mar 28, 2021
05:51 PM

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Mar 28, 2021
05:51 PM

l having problems plotting.

Mathcad and Excel file attached for your help please.

- Tags:
- smoothing

Mar 29, 2021
07:05 AM

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Mar 29, 2021
07:05 AM

What's the problem...it plots

doesn't it?

Luc

Mar 29, 2021
07:51 AM

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Mar 29, 2021
07:51 AM

Sorry wasn’t clear. Can’t plot the smoothed data.

Mar 29, 2021
09:08 PM

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Mar 29, 2021
09:08 PM

I don't see any attempt to plot r.smooth ??

Maybe you just have to move down the plot below the definition of r.smooth?

Mar 29, 2021
09:15 PM

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Mar 29, 2021
09:15 PM

Thanks!

Mar 30, 2021
05:19 AM

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Mar 30, 2021
05:19 AM

An additional remark:

It looks like you got confused by the indexing of vectors. By default Prime starts with zero.

You defined your range i starting from 1 and then plotted Loc[i over i. That way your plot gets shifted to the left for 1 unit - the first value of your data vector "Loc" is ignored and the second one (index 1) is assigned to 1, etc.

Correct plot should look that way:

Mar 30, 2021
05:34 AM

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Mar 30, 2021
05:34 AM

Thanks for spotting that.