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#Please ensure that if you need to use the agg backend that you have chosen it before 
#Please ensure that if you need to use the agg backend that you have chosen it before 
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#calling functions in this file 
#calling functions in this file 
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import numpy as np 
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# Calculate the location of quivers for a matplotlib plot 
# Calculate the location of quivers for a matplotlib plot 
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# quivshape :: [x,y] :: number of quivers in x and y direction 
# quivshape :: [x,y] :: number of quivers in x and y direction 
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# lenxax :: length of model along x 
# lenxax :: length of model along x 