@Thomas Dean you could try a semilogplot

I am not sure what application was mentioned that brought you here but perhaps it was this MapleV application which can be found in the app center here https://www.maplesoft.com/applications/view.aspx?SID=3743  Bode and root locus plots

whoa!  Didn't realize he was answered in 2008.

Thanks Kitonum and Carl for some answers.

I thought also one could use ListTools:-Occurences. 

I thought there was a way to do this without the use of any packages. 

@NorwegianStudent I had to convert to jpg since I was using Maple 18 but try this for the mask.

I've had excellent luck with _Maxim_'s code.  Multiple thanks again _Maxim_ for your code.  I've just expanded on the piecewise part to create multiple circled out areas using "or" and I also, luckily, haven't had any problems with freezing up. 

However I've only manually adjusted by trial and error to mask the proper areas.  It's a bit of grunt work, I actually didn't pay attention to the importance of the PlotHistogram as a tip for helping until I read the above again. 

Is there an index that takes into account proper spacing and capitization? 

aside, it's possible these spams were generated by bots.

**edit added** Basically if many errors are present the normal readability index's SMOG etc.. should be penalized points and be put into a worse situation.  In other words the poorly written spam document shouldn't deserve to get even close to any well written documents. 

** Statistics to a written document could be added, regarding the spacing and capitalizations, to determine wether it is very poorly written or just merely an odd typing mistake.  Based on that it we could classify it as most likely a legitimate document or not likely a legitimate document. 

@ahmer Lamp package is the package you need to run those commands, you mentioned you already have it.  Go to the site I directed you to earlier and it will tell you where to place the files from the lamp package so you can use it. 

If you've placed the lamp package in the location mentioned in the link then using with(Lamp) will allow the use of the package.  However it sounds like you have not run libname:=libname, "location of lamp package"

Did you run with(Lamp) ?  And what errors did you get when you ran that line? 

**edit add** ok yes I see you have indeed not loaded the lamp package properly.  You need to run the libname:=libname,"location of lamp package" first .  It actually mentions the error you see on the link I gave you and why it shows up and how to rectify it.  You should read it.

And no, the functions you want to run do not exist in any built in maple package which is why they are not defined. 

@ahmer If you have the LAMP package then I suggest going here if you are having problems installing it

http://mathsci2.appstate.edu/~sjg/class/2240/libname.html

Something to note.  The LAMP package was designed for Maple 6.  Most commands in the package likely will not work properly with Maple 15.  Most of the funtionality of the LAMP package is most likely built in to maple using other commands.  Is there a specific worksheet you are following?

@Preben Alsholm so far I have found this

@acer indeed I did.  I borrowed _maxim_'s answer yes.  But no one was replying I felt forced to create another question in which someone might  bring forth some answers.  If that is frowned upon, then I will refrain.  Sorry.

@_Maxim_ That is absolutely brilliant!  Great work!

How did you determine the mask?

@tomleslie thanks for the in depth explanation.  I understand what needs to be done, but how to put that into maple code?

And now we need to mask and transform back to the spatial plane.

@_Maxim_ ok thanks.  Replacing SignalProcessing:-FFT(img) with DiscreteTransforms:-FourierTransform makes it work.  Thanks

@_Maxim_ I'm using M18 and I get an error after img2 execution.

Error, (in SignalProcessing:-Engine:-FFT) data is not one-dimensional

@tomleslie actually I just copied the page from matlab.  I don't have the image.  But I found one similar on google images - here's the image but mapleprimes won't allow to insert it as a .jpg

**edit added** The file must be zipped to allow a download link to be added.