plot gridded data only inside shapefile

I import a shapefile and have gridded data that exceeds the borders of the shapefile. How can i only plot the data within the shapefile?

shp = shaperead("Germany.shp");
data.Lat = linspace(0,90,200);
data.Lon = linspace(0,90,200);
data.Height = rand(1,200);

Answer 1

[KSSV]

Read about inpolygon.