I have some data showing how many people come into and leave a group over time. I wanted to see the retention of members from one month to the next. Using area plots I was able to make a… 続きを読む >>
There are lots of places in optimization and game theory where you would want to identify a saddle point on a two-dimensional surface. In this example we find and visualize the saddle point of a… 続きを読む >>
The best way to modify a MATLAB figure is to just modify the code that generated it. I prefer this because it is better to be able to regenerate a figure from code if you want to keep modifying it… 続きを読む >>
A MATLAB user on MATLAB Answers wanted to know how to change all the pixels in an image that were below a certain threshold. The answer was correct, but very terse. I wanted to expand upon the… 続きを読む >>
The very common MATLAB error: “In an assignment A(I) = B, the number of elements in B and I must be the same.” occurs when one side of an assignment has a dfferent dimension than the… 続きを読む >>
The new release of MATLAB R2014b brings a new graphics engine. This allows for some new capabilities such as rotating tick labels and using dot notation in referencing graphics properties. These… 続きを読む >>
When you have timers and callbacks in your code, it can be difficult to find out when certain errors are occuring. Use DBstack to find the debug stack trace in MATLAB. This will allow you to find… 続きを読む >>
In last week’s post, I showed how to generate code in MATLAB to automatically read in a file. In this video I show how to make a simple wrapper function around code generated in that way. … 続きを読む >>
I recently was asked how to import from Excel but only bring in a certain part of the file. You might want to do this if you have headers or just want a small part of the spreadsheet to come into… 続きを読む >>
This video is a follow on to last week’s. Instead of making a line with different colored markers in MATLAB, we will be making a multi-color line in MATLAB. This is actually stretchig the… 続きを読む >>