[h5,nc]ndims: improve validation, speed test

Author: scivision

+stdlib/+hdf5nc/h5ndims.m

@@ -11,7 +11,12 @@
 
 arguments
   file (1,1) string {mustBeFile}
-  variable (1,1) string {mustBeNonzeroLengthText}
+  variable string {mustBeScalarOrEmpty}
+end
+
+if isempty(variable) || strlength(variable) == 0
+  frank = [];
+  return
 end
 
 dsi = h5info(stdlib.fileio.expanduser(file), variable).Dataspace;

+stdlib/+hdf5nc/h5size.m

@@ -7,7 +7,7 @@
 % variable: name of variable inside file
 %
 %%% Outputs
-% fsize: vector of variable size per dimension
+% fsize: vector of variable size per dimension. Empty if scalar variable.
 
 arguments
   file (1,1) string {mustBeFile}

+stdlib/+hdf5nc/ncndims.m

@@ -11,7 +11,12 @@
 
 arguments
   file (1,1) string {mustBeFile}
-  variable (1,1) string {mustBeNonzeroLengthText}
+  variable string {mustBeScalarOrEmpty}
+end
+
+if isempty(variable) || strlength(variable) == 0
+  frank = [];
+  return
 end
 
 dsi = ncinfo(stdlib.fileio.expanduser(file), variable);

+stdlib/+hdf5nc/ncsize.m

@@ -7,7 +7,7 @@
 % variable: name of variable inside file
 %
 %%% Outputs
-% fsize: vector of variable size per dimension
+% fsize: vector of variable size per dimension. Empty if scalar variable.
 
 arguments
   file (1,1) string {mustBeFile}

+stdlib/+test/TestHDF5.m

@@ -130,6 +130,9 @@ function test_size(tc)
 import stdlib.hdf5nc.h5ndims
 basic = tc.TestData.basic;
 
+tc.verifyEmpty(h5ndims(basic, string.empty))
+tc.verifyEmpty(h5ndims(basic, ""))
+
 if ~verLessThan('matlab', '9.8')
   r = h5ndims(basic, '/A0');
   s = h5size(basic, '/A0');

+stdlib/+test/TestNetCDF.m

@@ -118,6 +118,9 @@ function test_size(tc)
 import matlab.unittest.constraints.IsScalar
 basic = tc.TestData.basic;
 
+tc.verifyEmpty(ncndims(basic, string.empty))
+tc.verifyEmpty(ncndims(basic, ""))
+
 r = ncndims(basic, 'A0');
 s = ncsize(basic, 'A0');
 tc.verifyEmpty(s)