4.46.3 Can you answer these questions?

4.46.3.1 Default options of LinearSolve

https://mathematica.stackexchange.com/questions/160693/default-options-of-linearsolve

 
I would like to know what is the default options of LinearSolve when using LinearSolve[A,b], where A is a sparse matrix. There are several methods available such as Cholesky and Krysol etc., see here.  ...
 

- asked by Wilhelm 1vote

4.46.3.2 Prevent Semi-Transparent Pixels in Export

https://mathematica.stackexchange.com/questions/160578/prevent-semi-transparent-pixels-in-export

 
I've noticed that when I export plots in Mathematica without a background, a lot of the text ends being made of semi-transparent pixels.  For example: 
 
myplot = ContourPlot[Cos[x] + Cos[y], {x, 0, 4  ...
 

- asked by ereHsaWyhsipS 1vote

4.46.3.3 Identifying the range of the voice

https://mathematica.stackexchange.com/questions/160731/identifying-the-range-of-the-voice

 
I'm trying to do an equalization in an audio program called Audition. 
 
To have a good voice equalization, I need to have a frequency range of my voice. 
 
A minimum value and a maximum frequency value. 
 
...
 

- asked by LCarvalho 2votes

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