| adj_angle_sum_variance | Variance of the sum of adjacent angles | 
| angle_variance | Variance of the angles at vertices | 
| centroid_distance_variance | Variance of the distance from the centroid | 
| classify_shape | Classify a shape | 
| clip | Clip image border | 
| extract_fields | Extract fields from an image, given the boundaries | 
| get_boundaries | Get coordinates of boundaries of fields | 
| get_field_predictors | Calculate specified predictors for given fields | 
| get_shape_predictors | Get predictors for a shape | 
| get_shapes | Get a list of shapes on the image | 
| get_sides | Get sides of shape | 
| get_vertices | Get possible vertices | 
| moving_average | Smooth vector using moving averages | 
| plot.shape | Function for plotting shape objects | 
| rgb2col | Get the nearest color name from rgb | 
| shape_from_pixset | Make a 'shape' object from a pixset | 
| shape_predictors | We'll define a vector of names of predictor functions which... | 
| shift | Shift a vector cyclically | 
| side_length_variance | Variance of the lengths of sides (distance between vertices) | 
| slide_matrix | Slide a matrix in a given direction | 
| slide_matrix_single | Internal function used to slide a matrix in a single... | 
| solid_blobs | Find solid color connected areas in the image | 
| vertex_count | Number of possible vertices | 
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