Re-Initialze existing cell with zeros without specifying dimensions

Is there a way to re-initialize an existing cell / array without specifying the dimensions of said cell / array?

Ie.

tempArr1(7,5) = zeros % First instance of use  

tempArr1 = some function or command % Second instance of use returning the tempArr1 (7,5) of zeros?

Answer 1

[Guillaume]

To set all the values of array x to 0:

x(:) = 0;

[Jay]

Thankyou.

Answer 2

[Massimo Zanetti]

Implicitly invoke the creation of a cell/array using the size of the object you want:

A=cell(4,5,6);
B=cell(size(A))

A=zeros(3,4,5);
B=zeros(size(A))

Is that what you need?

Answer 3

[Walter Roberson]

tempArray(:) = 0;

Or

tempArray = zeros(sizeof(tempArray),  class(tempArray) ) ;

Or

tempArray = 0 * tempArray ;

For cells...

tempArray = cellfun(@(C) 0*C,tempArray, 'uniform', 0)