A heat map (or heatmap) is a 2-dimensional data visualization technique that represents the magnitude of individual values within a dataset as a color. The variation in color may be by hue or intensity. "Heat map" is a relatively new term, but the practice of shading matrices has existed for over a century. History Heat maps originated in 2D displays of the values in a data matrix. Larger values were represented by small dark gray or black squares (pixels) and smaller values by lighter squares. Toussaint Loua (1873) used a shading matrix to visualize social statistics across the districts of Paris. Sneath (1957) displayed the results of a cluster analysis by permuting the rows and the columns of a matrix to place similar values near each other according to the clustering. Jacques Bertin used a similar representation to display data that conformed to a Guttman scale. The idea for joining cluster trees to the rows and columns of the data matrix originated with Robert Ling in 1973. Ling used overstruck printer characters to represent different shades of gray, one character-width per pixel. Leland Wilkinson developed the...

There was also an increase in heat-related medical calls for firefighters on the line. Cal Fire officials reiterated the need to stay hydrated.

LAKE BUENA VISTA, Fla. (AP) — Jimmy Butler set the tone for the Miami Heat season on the first day of training camp.

Expert recap and game analysis of the Miami Heat vs. Los Angeles Lakers NBA game from October 9, 2020 on ESPN.

Expert recap and game analysis of the Miami Heat vs. Los Angeles Lakers NBA game from December 28, 2022 on ESPN.

Generator sales are revving up at power-supply stores as multiple calamities collide in the Bay Area: power shut-offs, wildfires ravaging homes, bad air quality and heat waves — all in the middle of a pandemic.

LeBron James hit a lot of clutch shots on Saturday against Miami. He missed the last one. He made a lot of huge plays. He passed on two huge ones. The debate continues. So what does the Heat's win mean for Miami and Indiana? We break down the good, the bad and the ugly of the night LeBron was clutch and unclutch at the same time.