python - Healpy map2alm and alm2map errors -

-

i'm studying healpy. interested in map2alm , alm2map: found question example of applying functions "to both sides" (in answer) provided. can see, significant errors in comparison original map after applying map2alm , alm2map consecutively.therefore want control these errors. question is:

  1. is there way reduce error, without using higher nside? (for example if want use nside)
  2. also, maybe there way "spectral characteristic" of map, wouldn't have such big errors?

no, there no other way.

going real space harmonic space doing fast fourier transform. if don't have enough time resolution, fft not going good, there not enough information have accurate representation frequency domain.

here same, way going have low error @ low nside if have signal represented in harmonic space, example pure dipole, see notebook, @ nside 8, error @ 1/1000:

http://nbviewer.jupyter.org/gist/zonca/2f87cb19ca8293539947b0d4aeca42b2


Comments

Post a Comment

Popular posts from this blog

html - Styling progress bar with inline style -

-
i trying set progress bar color red using inline style. need in way because have access <body> part of document. style need apply: progress { color: red } progress::-moz-progress-bar { background: red;} progress::-webkit-progress-value { background: red; } progress[aria-valuenow]:before { background: red; } i tried <progress style="background: red;"> incorrect effect, progress bar color turns blue red background. guide right direction desired style? thank in advance. here live example: https://jsfiddle.net/z36d3f6l/
Read more

java - Oracle Sql developer error: could not install some modules -

-
i have downloaded fresh copy of sqldeveloper ( sqldeveloper-4.1.3.20.78-no-jre ) oracle website. when unzip , lauch gui, keep getting following error message: warning - not install modules: dynamic module config - no module providing capability org.netbeans.netbinox found. my system: windows 7 32 bit hp probook. jdk 1.6 , 1.7, 1.8 available in java/jdk subdirectory. netbeans 8.0.2 installed finally got way out after dirty hours. extracted sqldeveloper zip in nested directory. i.e: e://a/b/c/sqldeveloper. starting sqldeveloper gui above directory threw erros. solution: go in c:\users**username**\appdata\roaming : delete sql developer , sqldeveloper folders extract sql developer zip in new non nested directory. i.e: e:// start , should work now reference: https://community.oracle.com/thread/3870680?start=0&tstart=0
Read more

How to use autoclose brackets in Jupyter notebook? -

-
this may sound silly question, how make use of autoclose brackets in jupyter notebook? example, when type print( jupyter notebook auto-closes brakets print() and places cursor inside. type argument, say print(1 + 1) now cursor between second 1 , right bracket ) . key navigate right of ) ? of course can press end or → or ) achieve this, not seem save time, purpose of brackets autoclose suppose? thanks in advance.
Read more