apop_linear_algebra.c File Reference

Functions

• double apop_det_and_inv (const gsl_matrix *in, gsl_matrix **out, int calc_det, int calc_inv)
• gsl_matrix * apop_matrix_inverse (const gsl_matrix *in)
• double apop_matrix_determinant (const gsl_matrix *in)
• apop_data * apop_matrix_pca (gsl_matrix *data, int dimensions_we_want)
• void apop_vector_increment (gsl_vector *v, int i, double amt)
• void apop_matrix_increment (gsl_matrix *m, int i, int j, double amt)
• void apop_vector_log10 (gsl_vector *v)
• void apop_vector_log (gsl_vector *v)
• void apop_vector_exp (gsl_vector *v)
• gsl_vector * apop_vector_stack (gsl_vector *v1, gsl_vector *v2, char inplace)
• gsl_matrix * apop_matrix_stack (gsl_matrix *m1, gsl_matrix *m2, char posn, char inplace)
• gsl_matrix * apop_matrix_rm_columns (gsl_matrix *in, int *drop)
• int apop_vector_bounded (const gsl_vector *in, long double max)
• apop_data * apop_dot (const apop_data *d1, const apop_data *d2, char form1, char form2)

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Detailed Description

Assorted things to do with matrices, such as take determinants or do singular value decompositions. Includes many convenience functions that don't actually do math but add/delete columns, check bounds, et cetera.

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Function Documentation

gsl_matrix* apop_matrix_rm_columns	(	gsl_matrix *	in,
		int *	drop
	)

Delete columns from a matrix.

This is done via copying, so if you have an exceptionally large data set, you're better off producing the matrix in the perfect form directly.

Parameters:

in

the gsl_matrix to be subsetted

Returns:

a gsl_matrix with the specified columns removed. If you ask me to remove no columns, I'll return a copy of the original. If you ask me to remove all columns, I'll return NULL.

Parameters:

drop

an array of ints. If use[7]==1, then column seven will be cut from the output.