record

When using Existential types, we have to use a pattern-matching syntax for extracting the forall ed value. We can't use the ordinary record selectors as functions. GHC reports an error and suggest using pattern-matching with this definition of yALL : {-# LANGUAGE ExistentialQuantification #-} data ALL = forall a. Show a => ALL { theA :: a } -- data ok xALL :: ALL -> String xALL (ALL a) = show a -- pattern matching ok -- ABOVE: heaven -- BELOW: hell yALL :: ALL -> String yALL all = show $ theA all -- record selector failed forall.hs:11:19: Cannot use record selector `theA' as a function due to

I am trying to record the sound from the MIC and draw a live graph. I am able to record and draw the graph. The problem is the values that are recorded using the code below are not accurate for example ... the image below is what i get when there is no sound at all present. I have seen examples using the fft but I am noot sure if that will be of any help in my case as I am trying to draw a time domain graph and I see no purpose to convert it to frequency domain (for now). Others are using average power, this might be helpful but I am not sure. Thanks for any help. bufferSize = AudioRecord

I am trying to get the basics of F# clear before moving on to complex examples. The material I'm learning has introduced both Discriminate Unions and Record types. I have reviewed the material for both, but it is still unclear to me why we would use one over the other. Most of the toy examples I have created seem to be implementable in both. Records seem to be very close to what I think of as an object in C#, but I am trying to avoid relying on mapping to c# as a way to understand F# So... Are there clear reason to use one over the other? Are there certain canonical cases where one applies?

Is there such a software? Pale Blue Dot Try this (Size -857 KB) (trial version - only 25 frames ) Try this free tool (unlimited frames) called Cropper. Set the output as Animated Gif. http://cropper.codeplex.com/ Update: In the notification area right click the cropper icon, go to Output > Animated Gif 来源： https://stackoverflow.com/questions/1636011/how-to-record-screen-and-save-as-gif-animation

Possible Duplicate: Is an iPhone Call Recorder theoretically possible? I am an iPhone devleoper. I want to record the conversation during phone call. I don't know apple is allowing to do this or not. If yes, than can anybody guide me how can i do this? Basically In my app ,I am recording 1 audio . Now when i call someone from my contact ,I want to play that audio as well as record the conversation. Both play and record thing I want. I am confused whether it is possible or not. There is no public API for recording the calls made (or received) by the built-in Phone app. You will have to

f=open('Student.dat','r+') # opens Student.dat file roll1=input("Enter roll to be found") # to find a record in a list using a roll no rec=f.readlines() for i,lst in enumerate(rec): if lst == roll1: print rec[i] Is this the proper way to use enumerate?? or should i use another loop within?? Here enumerate doesn't help much; you could use instead (which would be simpler and clearer): for i in rec: if i == roll1: print i enumerate is useful when you really need to get at the same time values and indices, which doesn't seem to be the case here. (In your piece of code rec[i] does the same thing