data vis chapter: popData struct does not contain pop variable

[MAKIO135]

From the data vis chapter, step 4 represent:

    float y = dimensions.y + ofMap( dataPoints[i].pop, 0, maxValue, dimensions.height, 0);

and dataPoints is defined like this:

typedef struct {

    int year;
    float ny;
    float lou;
    float ala;

} popData;

....
    vector < popData > dataPoints;

And maybe having a link to formatted data in csv for the chapter could be useful, so here it is:

Year,New York,Louisiana,Alabama,U.S. 
1900,1381625,7268894,1828697,76212168
1910,1656388,9113614,2138093,92228496
1920,1798509,10385227,2348174,106021537
1930,2101593,12588066,2646248,123202624
1940,2363880,13479142,2832961,132164569
1950,2683516,14830192,3061743,151325798
1960,3257022,16782304,3266740,179323175
1970,3641306,18236967,3444165,203211926
1980,4205900,17558072,3893888,226545805
1990,4219973,17990455,4040587,248709873

[bilderbuchi]

@tegacodes could you take a look if this is still relevant?