📊 2025-Jul-26 Large Data Set Plotting

A large data set of of the parameter Pressure Altitude of 622,801 points recorded every second from a Flight Data Recorder was generated for testing. The data was placed in a Comma Separated Variable (CSV) file. There are two columns. The 1st has Time and the 2nd one is Pressure Altitude". These descriptors are in the first row. In the second row are the units. The third row is where thr data starts .

First step was to set up a simple C++ Tcl and Tkinter (with Sun Valley theme) program. To start it has a File->Open CSV File menu at the top with four buttons: "Zoom In", "Zoom Out", "Pan Left" and "Pan Right".