![Write a function called avg max that takes a list of lists (sublists may be empty) and return the average of the largest item in each sublist as a float. If a sublist is empty, do not consider it for the purposes of computing average. You may assume that everything inside a non-empty sublist is a number. You may assume that at least one sublist will be non-empty. For example: Result Test print (avg_max (I1,2,31,141,1)) print (avg_max (II1,2,3],14,[8,1,5.0]])) 5.0 print (avg_max(I0])) 3.5](http://img.homeworklib.com/questions/b44f4670-bd3f-11ec-a388-27c17da6148d.png?x-oss-process=image/resize,w_560)
Write a function called avg_max that takes a list of lists (sublists may be empty) and return the average of the largest item in each sublist as a float. If a sublist is empty, do not consider it for the purposes of computing average. You may assume that everything inside a non-empty sublist is a number. You may assume that at least one sublist will be non-empty.
Homework Answers
Hydrological Analysis – requires information on rainfall over an area, say, over a catchment
Methods used to convert point rainfall values at different raingauge stations into an average value over a catchment include
- Arithmetical Mean Method
- Thiessen Polygon Method
- Isohyetal Method etc
Arithmetical Mean Method
Thiessen Polygon Method
• Rainfall recorded at each station is given a weightage based on the area closest to the station
• Consider a catchment area with say, 3 raingauge stations. Let there be 3 stations outside the catchment, but in its neigbourhood. The catchment area is drawn to scale and the position of these 6 stations are plotted on it. These 6 stations are joined so as to get a network of triangles. Perpendicular bisectors are drawn to each of the sides of these triangles. These bisectors form a polygon around each station. If the boundary of the catchment cuts the bisectors, then the boundary is taken as the outer limit of the polygon. These bounding polygons are called Thiessen Polygons. The area of these polygons is measured with a planimeter or by grid overlay.
• This method is considered superior to the arithmetical averaging method since some weightage is assigned to each raingauge station
• Even raingauge stations located outside the catchment are used in computing mean precipitation
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