generating an equispaced vector using a variable

Hi, I have a variable that I want to use to make each variable in part of a vector equi-spaced, and I cannot figure out why it is not working. In the code below it works for variable "a" but not "aNumber", I'm sure this is obvious but I cannot see it. Does anyone know why Matlab is treating "a" differently from "aNumber"?

B=nan(57,5)

aNumber=1.111

a=1
B(1:50,1)=(1:50)
B(1:50,2)=(1:1:50)
B(1:50,3)=(a:1:a*50)
B(1:50,4)=(a:a*50)
B(1:50,5)=(aNumber : aNumber*50)

gives...

Subscripted assignment dimension mismatch.

Error in untitled36 (line 25)
B(1:50,5)=(aNumber : aNumber*50)

Best regards,

Steve

[Stephen23]

"Does anyone know why Matlab is treating "a" differently from "aNumber"?"

You do not say what value aNumber has, but I am guess that it is not equal to one: if this is the case, how many elements does this have?:

aNumber : aNumber*50

Lets try an example, with aNumber = 2:

2 : 2*50
2 : 100

Does this have 50 elements, like the first four rows have? How did you check?

[Guillaume]

@Stephen, he does say (but the post was badly formatted). aNumber is 1.111

[Stephen Devlin]

For some insane reason I just thought aNumber:aNumber*50 would give 50 multiples of aNumber, much appreciated assistance from everybody, apologies for overlooking the formatting which didn't include aNumber as code.

[Guillaume]

aNumber * (1:50)

would give the 50 multiples

[Stephen Devlin]

Thank you Guillaume

Answer 1

[KSSV]

This would be more apt:

B(1:50,5)=linspace(aNumber , aNumber*50,50)

then

B(1:50,5)=(aNumber : aNumber*50)

Your line creates 1X55 vector, so the error...you actually need 1x50 vector.

[Stephen Devlin]

hi KSSV, how is it creating a 1x55 vector? Ive checked your answer and it works, I still can't see why mine didn't for "aNumber" when the same code worked for "a"?

[Guillaume]

how is it creating a 1x55 vector

>> aNumber = 1.111
>> aNumber*50
ans = 
  55.549999999999997
>> aNumber : aNumber*50
ans =
  Columns 1 through 9
        1.111        2.111        3.111        4.111        5.111        6.111        7.111        8.111        9.111    
  ...
  Column 55
       55.111

[Stephen Devlin]

(stabs head with fork) I get it now, thanks KSSV