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This utility can be called two ways: (a) specify R and theta; (b) provide the ecd object. But not at the same time.
ecd.y0_isomorphic(theta = NaN, R = 1, object = NULL)
numeric vector, the polar coordinate
optionally, a single ecd object
the value of y(0)
# NOT RUN { t <- 45/180*pi ecd.y0_isomorphic(t) # }
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