MATLAB: What is wrong in this? how to use isinteger

isintegervalid_date

function valid= valid_date3(y,m,d)
    if ~isscalar(y) || ~isscalar(m) || ~isscalar(d) || ~isinteger(y) || ~isinteger(m) || ~isinteger(d) || y<1 || m<1 || d<1
        valid=false;
        return
    end

valid=valid_date3(1900,2,28)

valid =

logical

Best Answer

To test whether a variable is integer-valued, you would do

y==round(y)

isinteger is for something completely different. It simply tests whether y is stored in floating point form, or as an integer data type, e.g.,

>> isinteger(5)
ans =
  logical
   0
>> isinteger(uint8(5))
ans =
  logical
   1

Related Solutions

MATLAB: If else problem for year

All of those if-elseif blocks make the code difficult to read, and difficult to debug as well. I would advise against that approach, and instead tackle each issue one at a time and code only for that issue. That makes the logic of each test much easier to read and to debug. For example, here is an outline of what the code could do using words:

function valid = valid_date(year,month,day)
valid = false; % Set a default return value
% Check for positive integer scalar inputs
if( the year is not a positive integer scalar )
    return;
end
if( the month is not a positive integer scalar )
    return;
end
if( the day is not a positive integer scalar )
    return;
end
% Check for proper month
if( the month is not between 1 and 12 inclusive )
    return;
end
% Construct an array of the number of days in each month
days_in_month = a 12-element array of the number of days in each month;
% Check to see if this is a leap year
is_leap_year = (you put some code here to determine if the year is a leap year)
% If it is a leap year, change February number of days to 29
if( is_leap_year )
    Change the days_in_month value for February to 29
end
% Check to see if the day number is valid
if( the day is greater than the number of days in the month )
    return;
end
% Passed all of our checks, so the date must be valid
valid = true;
return;
end

Once you are satisfied that the words do what you want (you should check this yourself ... maybe I missed something that needs to be checked), then you need to write actual code for all of the worded places. The code you write for this outline will in many places be pieces of the code you have already written in your if-elseif blocks above.

MATLAB: Invalid syntax at ‘=’ . A ‘(‘ might be missing a closing ‘)’

if (f == 0)

and same thing in this line

      if(~isinteger(NMAX) || NMAX == 0 || ischar(NMAX))

Best Answer

Related Solutions

MATLAB: If else problem for year

MATLAB: Invalid syntax at ‘=’ . A ‘(‘ might be missing a closing ‘)’

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