linear fit for dates that do not have data

Suppose I have table such as

Date            Visitors
-------------------------------------
"January 1"       10
"January 2"
"January 3"       15
"January 4"
"January 5"
"January 6"
"January 7"       18
"January 8"

I want to fill a linear trend for missing data

Date            Visitors
-------------------------------------
"January 1"       10
"January 2"       12.5
"January 3"       15
"January 4"       15.75
"January 5"       16.5
"January 6"       17.25
"January 7"       18
"January 8"

I saw https://www.mathworks.com/matlabcentral/answers/327828-linear-fit-to-data

but what I try to do here is to apply different fit function for different intervals: the fit function for January 1 and 3 is different from the one for January 3 to 7.

[Walter Roberson]

Filling ending up with a duplicate value is not filling with linear trend.

[alpedhuez]

Corrected before I saw your post.

Answer 1

[Ameer Hamza]

See fillmissing(): https://www.mathworks.com/help/matlab/ref/fillmissing.html. You can use the linear method to fill the values.

[alpedhuez]

Thank you.