How to make the question reappear if someone mess up with the number ? eg. 0 to 4. And then someone type 5.

ques_1 = input('\nIn the last month, how often have you been upset because of something that happened unexpectedly ?\n');

if they answer 5 , how i want to get back to the first question.

Answer 1

[Walter Roberson]

while true
    ques_1 = input('\nIn the last month, how often have you been upset because of something that happened unexpectedly ?\n');
    if isnumeric(ques_1) && isscalar(quest_1) && ismember(ques_1, 0:4)
      break;
    end
end

[MUHAMMAD LUQMAN CHE LAH]

In the last month, how often have you been upset because of something that happened unexpectedly ?

0

Unrecognized function or variable 'quest_1'.

Error in TEST_3 (line 3)

if isnumeric(ques_1) && isscalar(quest_1) && ismember(ques_1, 0:4)

there is an error :(

[MUHAMMAD LUQMAN CHE LAH]

I just want the user to input any number between 0 to 4 so that they can move to the next question.

When they input any number more than 4 or less than 0, it will restart the question back.

eg.

In the last month, how often have you been upset because of something that happened unexpectedly?

• if user answer 0, then move to the next question which is

In the last month, how often have you felt that you were unable to control the important things in your life?

• if user answer 5 or -1 or any number other than 0 to 4, it will reappear this question.

Thank you in advance.

[Walter Roberson]

while true
    ques_1 = input('\nIn the last month, how often have you been upset because of something that happened unexpectedly ?\n');
    if isnumeric(ques_1) && isscalar(ques_1) && ismember(ques_1, 0:4)
      break;
    end
end

[MUHAMMAD LUQMAN CHE LAH]

Thank you Mr. Roberson, may i know what is the meaning of function isnumeric,isscalar and ismember ?

I have read the documentation and still do not understand it.

Perhaps you can explain it briefly.

Thank you in advance. :')

[Walter Roberson]

isscalar(EXPRESSION is

isequal(size(EXPRESSION), [1 1])

That is, the expression must have exactly one row and one column (and no further dimensions) -- not a vector, not an array, and not empty. (Empty variables have length 0 in at least one dimension.)

isnumeric(EXPRESSION) is

ismember(class(EXPRESSION), {'single', 'double', 'int8', 'uint8', 'int16', 'uint16', 'int32', 'uint32', 'int64', 'uint64'})

In particular, isnumeric() does not include char or string or cell array or struct or logical -- just the built-in numeric datatypes

ismember(EXPRESSION, NUMERIC_LIST) is

OUTPUT = false(size(EXPRESSION));
for K = 1 : numel(EXPRESSION)
   if any(EXPRESSION(K) == NUMERIC_LIST(:))
     OUTPUT(K) = true;
   end
end

So after we have ensured that ques_1 is scalar and numeric, then

ismember(ques_1, 0:4)

would mean the same as

ques_1 == 0 | ques_1 == 1 | ques_1 == 2 | ques_1 == 3 | ques_1 == 4