Physics 203 at Portland State 2014

Site Tools

white_noise_project
A PCRE internal error occured. This might be caused by a faulty plugin

====== Differences ====== This shows you the differences between two versions of the page.

white_noise_project [2014/05/25 06:11]
wikimanager [Software and data analysis]
white_noise_project [2014/06/04 03:46] (current)
wikimanager [Software and data analysis]
Line 123: Line 123:
* Switch to the editing software (e.g. Word or Pages), and paste at the desired spot         * Switch to the editing software (e.g. Word or Pages), and paste at the desired spot
* on a PC, press ''​Alt''​ and ''​PrtScn''​ ("​Print Screen"​) at the same time, then release       * on a PC, press ''​Alt''​ and ''​PrtScn''​ ("​Print Screen"​) at the same time, then release
-        * Switch to the editing software (e.g. WordPowerpoint, or Paint)+        * Switch to the editing software (e.g. WordPowerpoint, or Paint)
* Paste at the desired spot         * Paste at the desired spot
* Crop the excessive margins as needed         * Crop the excessive margins as needed
Line 165: Line 165:
* Try to offer your intuition as to why adding (averaging) several pure sine waves results in such a drastically different histogram         * Try to offer your intuition as to why adding (averaging) several pure sine waves results in such a drastically different histogram
* If intrigued, try to experiment with fewer than 200 sine waves. At what point does the dramatic change of the histogram happen?         * If intrigued, try to experiment with fewer than 200 sine waves. At what point does the dramatic change of the histogram happen?
+    * //<color red>​**Question**</​color>//:​ I need to figure out what is wrong with my frequency graph (average of 200 sine waves). I have re-plotted it again, checked my formulae, and I still am unable to find any error.  ​
+      * //​**Answer**//:​ I looked at your file, and the data is actually correct. The problem is with your plot.  Do you know how to change the axis range? As it is now, you are "​zoomed in" too much on your figure: the //x// axis is only from 0.1 to 0.3 s somehow, and the //y// axis is from $-0.02$ to $+0.02$. Basically it is blowing up a tiny little aspect of the plot, and not showing the whole picture. ​