not enough input argument error

when I put( [1×128 double], 'E') as input argument it says that "Error using double. Not enough input argument. " What's wrong with it ?

[madhan ravi]

We are not magicians , show the code.

Answer 1

[Image Analyst]

If your function is called MyFunc() and it expects two variables, a 1x128 double vector and a single character, then you need to pass that, not the word double. When it sees "double" it's expecting to call the double() function which needs a variable to make into a double class.

dblVec = rand(1, 128); % A 1 x 128 vector of doubles
ch = 'E'; % A single character vector.
results = MyFunc(dblVec, ch)

[Maria]

Is this run onto command window?

[Image Analyst]

It could be. I don't know where you ran it. Where were you interacting with MATLAB when it threw that error? What were you doing?

[Maria]

I ran it on command window here

[Image Analyst]

Like I said, you have to pass in something for the first argument. What do you want to pass it? How about just random numbers, like this:

>> r = rand(1, 128); % Or whatever you want.
>> scales(r, 'E')

Answer 2

[Steven Lord]

It seems like you're trying to call a function using the description of a variable from the Workspace window rather than the variable itself.

It's like you tried to define a variable named x that is a double array of size 1x10.

>> x = 1:10;
>> whos x
  Name      Size            Bytes  Class     Attributes

  x         1x10               80  double              

In order to call a function like sin on it, you don't pass in the description of the variable:

>> sin(1x10 double)
 sin(1x10 double)
      ↑
Error: Invalid expression. Check for missing multiplication operator, missing or
unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead
of parentheses.

Instead you pass the variable itself. Note that after I do that, y becomes a 1x10 double just like x was and is. Each element of y is the sine of the corresponding element of x: y(1) is the sine of x(1), y(2) the sine of x(2), etc.

>> y = sin(x);
>> whos x y
  Name      Size            Bytes  Class     Attributes

  x         1x10               80  double              
  y         1x10               80  double