how to use datefind function?

in help, I found this

Superset = datenum(1999, 7, 1:31);

Subset = [datenum(1999, 7, 10); datenum(1999, 7, 20)];

Indices = datefind(Subset, Superset, 5)

Indices =

          5
     6
     7
     8
     9
    10
    11
    12
    13
    14
    15
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25

here tolerance = (Optional) Tolerance (+/-) for matching the date numbers in Superset. but what to do if I want only previous dates. i.e.

     5
     6
     7
     8
     9
    10

    15
    16
    17
    18
    19
    20

only negative tolerance.

Answer 1

[Titus Edelhofer]

Hi,

use

which datefind

to find the file datefind.m in the finance toolbox. Copy it to your folder and name it "mydatefind.m". Open in the editor and replace the line

i = find(d <= tol);

by

i = find(d <= tol & super<=sub(idx));

Hope this helps,

Titus