How do I change a 2D char array to double array

I have a char array like this

val = 
  '1,106,54,40;421,389,234,21                                                                       '
  '592,391,259,20;2174,391,240,20                                                                   '
  '1,40,28,29;2863,1,139,36;2471,386,247,24;3224,1,114,30;3654,1,95,38;3780,76,60,29;1579,391,101,20'

This is 2D char array. For example,

val(1,1) = '1'
val(1,2) = ','

What I want to do is transforming this to double array

[1,106,54,40;421,389,234,21] (This case will be 2×4 double array)
[592,391,259,20;2174,391,240,20] (Also 2×4 double array)
[1,40,28,29;2863,1,139,36;2471,386,247,24;3224,1,114,30;3654,1,95,38;3780,76,60,29;1579,391,101,20] (7×4 double array)

My array may have empty row in 2D char array too. For example,

''

This has to be 0×0 double array

How can I do this? Thank you so much!

[Seung Woo Ham]

Actually, my 2D char array is much larger than this. So I have to use a loop function to handle this.

[Stephen23]

@Seung Woo Ham: do the matrices always have four columns?

Answer 1

[KSSV]

val = {'1,106,54,40;421,389,234,21 ' '592,391,259,20;2174,391,240,20 ' '1,40,28,29;2863,1,139,36;2471,386,247,24;3224,1,114,30;3654,1,95,38;3780,76,60,29;1579,391,101,20' };
iwant = cellfun(@str2num,val,'un',0)

[Seung Woo Ham]

Wow... You are a real MVP. Thank You!