I have no idea how to even approach this set of commands I am asked to execute. Any help will be amazing.

1.) Create a program that prompts the user to enter a scalar value for the outside air temperature. If the temperature is equal to or above 80.0F, send a message to the command window telling the user to wear shorts. If the temperature is between 60.0F and 80.0F, send a message to the command window telling the user that it’s a beautiful day. If the temperature is equal to or below 60.0F, send a message to the command window telling the user to wear a jacket or a coat.

2.) Use a for loop to sum the elements in the following vector:

x = [1, 23, 43, 72, 87, 56, 98, 33]

3.) Repeat the previous problem, this time using a while loop

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Answer 1

[Image Analyst]

See this snippet. Adapt as needed:

% Ask user for two floating point numbers.
defaultValue = {'45.67', '78.91'};
titleBar = 'Enter a value';
userPrompt = {'Enter floating point number 1 : ', 'Enter floating point number 2: '};
caUserInput = inputdlg(userPrompt, titleBar, 1, defaultValue);
if isempty(caUserInput),return,end; % Bail out if they clicked Cancel.
% Convert to floating point from string.
usersValue1 = str2double(caUserInput{1})
usersValue2 = str2double(caUserInput{2})
% Check for a valid number.
if isnan(usersValue1)
    % They didn't enter a number.  
    % They clicked Cancel, or entered a character, symbols, or something else not allowed.
  % Convert the default from a string and stick that into usersValue1.
    usersValue1 = str2double(defaultValue{1});
    message = sprintf('I said it had to be a number.\nTry replacing the user.\nI will use %.2f and continue.', usersValue1);
    uiwait(warndlg(message));
end
% Do the same for usersValue2

theSum = 0;
for k = 1 : length(x)
   theSum = ....... x(k) .....you finish
end
index = 1
while index < length(x)
  theSum = ....  % Add in the value of x for that index
  index = .... % Increment the index
end