As you can see from the image below, I have a sheet of horizontal and vertical dots (matrix). Then I have a shape. I am trying to create a " dotted " shape. ie, I would like to create an intersection of dots and shape so that the shape will look as if it is made of dots.

https://i.imgur.com/n0cK15C.png

It will be great to have some help

Path operators are generally for one path affecting one path. I might try un-linking all the clones, un-grouping any groups, and path>combine all the dots into a single compound path. Then, do the intersection.

There is also the option of making your dots into a custom pattern. 
http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Attributes-Fill-Stroke.html#Attributes-Patterns

Thanks @TylerDurden I tried path > combine and then path > intersection, it didn't help. I am trying to create a font out of this. I have tried object to pattern in my previous effort. While creating fonts, it won't help.

PS : The link gives 404 error

Link works here.

It was an error from my side. The shape was a group  ( which I didn't know ). I ungrouped it and all is fine now. Works great. Thank you.

 I need a small help with this. Now that I have the intersection the shape looks great ( image attached ).

But since my aim is to create a font from these shapes, looks like I would need independent shapes ( ie, a set of dots ). Just like Pattern, Clip, Intersection shape is also not acceptable while making a font from what I see. Is there any method where I can unlink / ungroup these dots into individual dots ? Or create a set of individual dots just like this source image above ? Thanks.

Path > Break Apart does it :)

Found out that  " Intersection " method itself will work. I was using a bigger canvas size. Nevertheless, I now have more fall back options.