Is it possible to call on specific stimuli in a set and randomize it based on it's name.

I have 144 stimuli named:

1_1_C_D.jpg

1_2_K_C.jpg

1_3_G_F.jpg

1_4_F_H.jpg

1_5_B_K.jpg

1_6_G_C.jpg

1_7_A_F.jpg

1_8_E_K.jpg

1_9_D_B.jpg

1_10_D_E.jpg

1_11_F_D.jpg

1_12_L_G.jpg

2_1_H_E.jpg

2_2_K_H.jpg

2_3_B_D.jpg

2_4_B_J.jpg

2_5_L_A.jpg ... etc. to 12

In my experiment, each character represents a different attribute. I need to be able to call only one attribute at a time in the entire list, for example all stimuli that have x_x_A_x and randomize it - this would be the "same" condition

Also to be able to do the opposite, in this sense call any stimuli such as x_x_A_x and call on all other stimuli that can be anything except x_x_A_x - this would be the "different condition"

Is this possible to do in matlab? Thanks!

Answer 1

[Alberto]

You can do that using Regular expressions (so you can choose which files has the desired attribute) and the command dir so you can extract the full list of files.