Error "Size input must be scalar"

Sir, Here delu=randi(30,1), in which i want to add zeros(3,1) but when i am running this in my complete code it is showing "Size input must be scalar".

Please help me out with it.

delu=randi(30,1);
delU=([zeros(3,1);delu]);

[Rik]

Your code runs without error, as you can see.

delu=randi(30,1);
delU=([zeros(3,1);delu])

delU = 4×1

0 0 0 3

Answer 1

[Image Analyst]

MATLAB is case sensitive so delu is different than delU. Try this:

delu=randi(30,1) % Generate a single integer in the range 1-30

delu = 9

delu=([zeros(3,1);delu]) % Prepend 3 zeros above that number so it's now 4 rows tall.

delu = 4×1

0 0 0 9

whos delu

  Name      Size            Bytes  Class     Attributes

  delu      4x1                32  double              

[Chaudhary P Patel]

delU=([zeros(3,1);delu]) % This is U not u

[Image Analyst]

OK but it still works, you just have two variables with extremely similar spelling, which of course will be very confusing:

delu=randi(30,1) % Generate a single integer in the range 1-30

delu = 2

delU=([zeros(3,1);delu]) % Prepend 3 zeros above that number so it's now 4 rows tall.

delU = 4×1

0 0 0 2

whos delU

  Name      Size            Bytes  Class     Attributes

  delU      4x1                32  double              

So why isn't it working for you? You are not even calling the size() function like the error says. You need to give us ALL your code.