Support partial reading of Zarr datasets

PythonModule/ZarrPy.py

@@ -87,10 +87,10 @@ def readZarr (kvstore_schema, starts, ends, strides):
 
     Parameters:
     - kvstore_schema (dictionary): Schema for the file store (local or remote)
-    - starts (list): Array of start indices for each dimension (0-based)
-    - ends (list): Array of end indices for each dimension (elements 
+    - starts (numpy.ndarray): Array of start indices for each dimension (0-based)
+    - ends (numpy.ndarray): Array of end indices for each dimension (elements 
                    at the end index will not be read)
-    - strides (list): Array of strides for each dimensions
+    - strides (numpy.ndarray): Array of strides for each dimensions
 
     Returns:
     - numpy.ndarray: The subset of the data read from the Zarr file.
@@ -105,5 +105,5 @@ def readZarr (kvstore_schema, starts, ends, strides):
 
     # Read a subset of the data
     data = zarr_file[slices].read().result()
-    #data = zarr_file[...].read().result()
+
     return data

test/tZarrRead.m

@@ -139,18 +139,6 @@ function invalidPartialReadParams(testcase)
                 @()zarrread(zpath,Count=wrongNumberOfDimensions),...
                 errID);
 
-            errID = 'MATLAB:validators:mustBeRow';
-            wrongSize = [1; 1];
-            testcase.verifyError(...
-                @()zarrread(zpath,Start=wrongSize),...
-                errID);
-            testcase.verifyError(...
-                @()zarrread(zpath,Stride=wrongSize),...
-                errID);
-            testcase.verifyError(...
-                @()zarrread(zpath,Count=wrongSize),...
-                errID);
-
             %TODO: negative values, wrong datatypes, out of bounds
 
         end

zarrread.m

@@ -22,9 +22,9 @@
 
 arguments
     filepath {mustBeTextScalar, mustBeNonzeroLengthText}
-    options.Start {mustBeInteger, mustBePositive, mustBeRow} = double.empty(1,0);
-    options.Count {mustBeInteger, mustBePositive, mustBeRow} = double.empty(1,0);
-    options.Stride {mustBeInteger, mustBePositive, mustBeRow} = double.empty(1,0);
+    options.Start (1,:) {mustBeInteger, mustBePositive} = [];
+    options.Count (1,:) {mustBeInteger, mustBePositive} = [];
+    options.Stride (1,:) {mustBeInteger, mustBePositive} = [];
 end
 
 zarrObj = Zarr(filepath);