how can I remove 4 character of a string?

for example string is LASTNAME ,output=NAME

Answer 1

[KALYAN ACHARJYA]

s='lastname';
modified_s=s(5:end);

%Command Window
>> s='lastname'
>> modified_s=s(5:end)
s=lastname
modified_s=name

[Jan]

s(5:end) can be interpreted as: Keep the last part. This is the same as removing the leading 4 characters:

s      = 'lastname';
s(1:4) = [];

Answer 2

[John Cunningham]

If s needs to be a string, just convert to character, grab the indices you need, then convert back to string.

K>> s = "lastname";
K>> s = char(s);
K>> s = string(s(5:end))

s = 

    "name"

[Stephen23]

Simpler and more efficient to use indexing to access the character vector that is already inside the string container:

s = "lastname";
s{1} = s{1}(5:end)

s = "name"

No CHAR call, no STRING call required.

[Jan]

Or:

s = "lastname";
t = extractAfter(s, 4)