Remove equal sign parameter assignment to improve backwards compatibility

Author: robertoffmoura

plotly/plotly_aux/cell2json.m

@@ -1,4 +1,4 @@
 function str = cell2json(s)
-	strList = string(cellfun(@m2json, s, un=0));
+	strList = string(cellfun(@m2json, s, 'un', 0));
 	str = sprintf("[%s]", strjoin(strList, ", "));
 end

plotly/plotly_aux/makecall.m

@@ -16,14 +16,14 @@
 
     url = [domain '/clientresp'];
     payload = struct( ...
-            platform=platform, ...
-            version=plotly_version, ...
-            args=args, ...
-            un=un, ...
-            key=key, ...
-            origin=origin, ...
-            kwargs=kwargs ...
-     );
+            'platform',platform, ...
+            'version',plotly_version, ...
+            'args',args, ...
+            'un',un, ...
+            'key',key, ...
+            'origin',origin, ...
+            'kwargs',kwargs ...
+    );
 
     st = webwrite(url, payload);
 end

plotly/plotly_aux/plotlygenimage.m

@@ -23,7 +23,7 @@ function plotlygenimage(figure_or_data, filename, varargin)
         figure = struct('data', data);
     end
 
-    payload = struct(figure=figure, format=format);
+    payload = struct('figure',figure,'format',format);
 
     [un, key, domain] = signin;
 

plotly/plotly_aux/struct2json.m

@@ -1,5 +1,5 @@
 function str = struct2json(s)
     f = fieldnames(s);
-    strList = cellfun(@(x) sprintf('"%s" : %s', x, m2json(s.(x))), f, un=0);
+    strList = cellfun(@(x) sprintf('"%s" : %s', x, m2json(s.(x))), f, 'un', 0);
     str = sprintf("{%s}", strjoin(strList, ", "));
 end