How to replace space with zero in a table?

Hi!

I want to replace space with zero in the H4.Time without loop.

K>> head(H4)

ans =

  8×7 table

      Date       Time     Open     High      Low     Close    Volume
    ________    ______    _____    _____    _____    _____    ______

    20010102    200000     64.3    64.35    64.25    64.35     184  
    20010103         0     64.3    64.75     64.3    64.59     924  
    20010103     40000     64.6     64.7    64.39    64.52     932  
    20010103     80000    64.51    64.73    64.48    64.58     892

Any suggestion without loop to fix it?

Thanks.

[Walter Roberson]

Are the entries char or are they numeric? If they were originally numeric that got converted to fixed width then why not just 0 pad at the time?

Time = num2str([200000;0;40000;80000], '%06d')

Answer 1

[Walter Roberson]

H4.Time(H4.Time == ' ') = '0';

Answer 2

[Peter Perkins]

Sia, you may find that using the datetime datatype for Date, and the duration data type for Time, makes your life easier. Storing numbers as text is not likely to very convenient.