Merge branch 'eigenvalues' of github.com:perazz/stdlib into eigenvalues

Author: perazz

doc/specs/stdlib_linalg.md

@@ -921,7 +921,7 @@ The solver is based on LAPACK's `*GEEV` backends.
 
 ### Arguments
 
-`a` : `real` or `complex` square array containing the coefficient matrix. It is normally an `intent(in)` argument. If `overwrite_a=.true.`, it is an `intent(inout)` argument and is destroyed by the call. 
+`a` : `real` or `complex` square array containing the coefficient matrix. If `overwrite_a=.false.`, it is an `intent(in)` argument. Otherwise, it is an `intent(inout)` argument and is destroyed by the call. 
 
 `lambda`: Shall be a `complex` rank-1 array of the same kind as `a`, containing the eigenvalues. It is an `intent(out)` argument. 
 
@@ -970,15 +970,15 @@ The solver is based on LAPACK's `*SYEV` and `*HEEV` backends.
 
 ### Arguments
 
-`a` : `real` or `complex` square array containing the coefficient matrix. It is normally an `intent(in)` argument. If `overwrite_a=.true.`, it is an `intent(inout)` argument and is destroyed by the call. 
+`a` : `real` or `complex` square array containing the coefficient matrix. It is an `intent(in)` argument. If `overwrite_a=.true.`, it is an `intent(inout)` argument and is destroyed by the call. 
 
 `lambda`: Shall be a `complex` rank-1 array of the same precision as `a`, containing the eigenvalues. It is an `intent(out)` argument. 
 
 `vectors` (optional): Shall be a rank-2 array of the same type, size and kind as `a`, containing the eigenvectors of `a`. It is an `intent(out)` argument.
 
-`upper_a` (optional): Shall be an input logical flag. if `.true.`, the upper triangular part of `a` will be used accessed. Otherwise, the lower triangular part will be accessed. It is an `intent(in)` argument.
+`upper_a` (optional): Shall be an input `logical` flag. if `.true.`, the upper triangular part of `a` will be accessed. Otherwise, the lower triangular part will be accessed. It is an `intent(in)` argument.
 
-`overwrite_a` (optional): Shall be an input logical flag. if `.true.`, input matrix `a` will be used as temporary storage and overwritten. This avoids internal data allocation. This is an `intent(in)` argument.
+`overwrite_a` (optional): Shall be an input `logical` flag. If `.true.`, input matrix `a` will be used as temporary storage and overwritten. This avoids internal data allocation. This is an `intent(in)` argument.
 
 `err` (optional): Shall be a `type(linalg_state_type)` value. This is an `intent(out)` argument.