Figutils

A set of simple but useful figure utilities. Source data is NOT required.

Description

Figutils adds some uibuttons at the top of any figure, which allows operation on figure data, NOT requiring source data that the figures were generated with. It's a quick way to add, subtract, or average single lines or groups of lines. You can also invert, smooth (fractional octave smoothing), or even enter an arbitrary operation involving one line, a group of lines, or one line acting on a group of lines. Data can be taken form any open figure and plotted on any open figure. Additional functions could easily be added.

• MATLAB release: MATLAB 7.8 (R2009a)
• Other requirements: Signal processing toolbox required only for fractional octave smoothing, but not for general use.

[Chris]

As an electrical / acoustics engineer I've been looking for a function like this for several years. I would have written it myself but my signal processing skills are not where they need to be. I finally stumbled across this function, and decided to try it. The octave smoothing matches very nicely with Goldline TEF smoothing, until you get down to the low frequencies (I'm talking around 100 Hz), but upon inspection it could have something to do with 1.) not enough data points down here, or 2.) something else with the algorithm. I know another company, Audio Precision, uses a proprietary smoothing algorithm to accurately smooth the lower frequencies but I'm not sure what that is.

I'm giving it five stars because it does exactly what it needs to do, which for me is smooth frequency response information. Thanks Todd!

[Todd Welti]

Thanks, Chis. I'm glad it works for you. When I get some time, next thing is to add code to handle different number of points on different curves. So, it will have to interpolate...