Heat-records

Yesterday's temp

Given \(T_{ijk}\): 

-- \(T' = \max_k T_{ijk}[j == `0612`]\)

→ \(T'\) is a vector of length \(i\); it is also the data we see in the right

-- \(h = T'[i == `2022` ]\) 

→ \(h\) is the highlight

Let data be a 3D tensor \(T_{ijk}\); \(i\) for year; \(j\) for date; \(k\) for the # of records per day; it could also be seen as a 2D matrix when we drop \(k\)  and \(\max_k\)

Last 4 weeks' temp

Given \(T_{ijk}\): 

-- \(T' = \max_k T_{ijk}[`0509` \leq j \leq `0612`]\)

-- \(h = T'[i == `2022` ]\) 


extended \(j\) from scalar to interval;

changed highlight color from blue to pink (which, doesn't quite make sense, seeing that they map to the same h)   

Record high for the last 4 weeks 

Given \(T_{ijk}\): 

-- \(T' = \max_k T_{ijk}[`0509` \leq j \leq `0612`]\)

-- \(h = \max_i T'\) 

 

changed highlight;

left one pink highlight for the temperature record that is closest to the historical record 

Record high for the year 

Given \(T_{ijk}\): 

-- \(T' = h = \max_{i, k} T_{ijk}\)

The transition was in fact (1) \(\max_k T_{ijk}[`0509`\leq j \leq `0612`]\) to \(\max_{i, k} T_{ijk} [`0509` \leq j \leq `0612`]\)  and then

(2) dropping the date selection / filter \(\max_{i, k} T_{ijk}\) 

change in underlying data: matrix → (highlight) vector 

deck

By Sheng Long

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