====== PlayGround ======

<code>{{gallery>:playground?lightbox }}</code>
{{gallery>:playground?lightbox }}





===== coloUr =====

<color green> GREEEEEEEEEEN </color> 
<code>
<color green> GREEEEEEEEEEN </color>
</code>
<color red> red </color>
<code>
<color green> red </color>
</code>

===== FFT ==== 
Always forget this:

^ Indices^DC^ POSITIVE ^ NYQUIST ^ NEGATIVE ^
^ C  | ''0'' | ''1 .. N/2-1'' | ''N/2'' | ''N-1 .. N/2+1'' |
^ Matlab | ''1'' | ''2 .. N/2'' | ''N/2+1'' | ''N .. N/2+2'' |

<code>
^ Indices^DC^ POSITIVE ^ NYQUIST ^ NEGATIVE ^
^ C  | ''0'' | ''1 .. N/2-1'' | ''N/2'' | ''N-1 .. N/2+1'' |
^ Matlab | ''1'' | ''2 .. N/2'' | ''N/2+1'' | ''N .. N/2+2'' |
</code>

====== Example of problem ======

So look

===== I can edit this subsection =====

Without a problem 

==== And this one ====

Is okay too 

=== But how do I edit here ===

Without editing the whole page. Before I could edit this? What has changed?