matlab function "m = size(X,dim)" equivalent in opencv -

i new matlab, can me find equivalent opencv method matlab method "m = size(x,dim)"". better if know does? online documents not helpful little knowledge. thanks

update:

what role of dim "m = size(x,dim)" , how works. image(x) size of 200 * 200 , if pass dim=1, m=1 in matlab , if pass dim =2 , 40. can pl explain.

code:

image = 'd:\proposals\others\test_some_title1.jpg' top=size(image,2) 

as code:

image = 'd:\proposals\others\test_some_title1.jpg' top=size(image,2) 

image here not image. string containing file name (which happens image, size function doesn't know that). string indeed 40 characters long, hence result. read in image, use imread.

also, image function in matlab. if make variable called image stop using function (this source of lot of matlab errors).