Not Enough Input arguments error

% generate a random value for x

x = randi([1 100]);

% ask questions and ask for input

prompt1= 'x+4';

ans1 = inputdlg(sprintf("when x = %i \nWhat is x+4?",x));

myicon = imread("Jellybean.png");

%creates a while loop in the event of a correct answer

while input == x+4

msgbox('Correct! The frogs kiss your feet and you move on!',myicon);

%creates an if loop in the event of an incorrect answer

if input ~= x+4

msgbox('Incorrect! You are attacked by frogs! Try again to gain their trust.',myicon);

%retries the loop until the correct answer is given

continue

end

end

%i keep getting this error: Error using input Not enough input arguments. But im not sure where theres more than 1 input

Answer 1

[Star Strider]

I suspect the problem is the ‘input’ variable, since input is a function.

The solution is to rename ‘input’ to something else that makes sense in the context of the rest of the code.

Go frogs!

[Isobel Leikis]

yay frogs!

thank you for your help, i have changed the variable name.

x = randi([1 100]);

% asks questions and waits for user input

prompt1= 'x+4';

ans1 = inputdlg(sprintf("when x = %i \nWhat is x+4?",x));

myicon = imread("Jellybean.png");

% creates a while loop to handle the user input

while ans1 == x+4

msgbox(['Correct!';'The frogs kiss your feet and you move on!'],myicon);

% creates an if loop for the event of an incorrect answer

if ans1 ~= x+4

msgbox(['Incorrect!';'You are attacked by frogs! Try again to gain their trust.'],myicon);

% runs the loop until the correct answer is given

continue

end

end

Now i have this error: Operator '==' is not supported for operands of type 'cell'.

do i need to rethink my loops?

thank you!

[Star Strider]

The loops are likely fine (although I did not run the complete code).

Similar problem — ‘ans1’ is a cell array (and this time, also a character array), so:

ans1 = inputdlg(sprintf("when x = %i \nWhat is x+4?",x))

ans1 = str2double(ans1)

The str2double function removes it from the cell array and evaluates it as a double-precision scalar.

The rest of the tests on it should work.

.

[Isobel Leikis]

%Thank you for your help, that moved my program along further

% generate a random integer value for x between 1 and 100

x = randi([1 100]);

% asks a question and waits for user input

prompt1= 'x+4';

ans1 = inputdlg(sprintf("when x = %i \nWhat is x+4?",x));

% removes ans1 from the cell array and evaluates it as a double precision scalar

ans1 = str2double(ans1);

% creates a while loop to handle the user input

while ans1 == x+4

msgbox(['Correct!';'The frogs kiss your feet and you move on!'],myicon);

% creates an if loop for the event of an incorrect answer

if ans1 ~= x+4

msgbox(['Incorrect!';'You are attacked by frogs! Try again to gain their trust.'],myicon);

% runs the loop until the correct answer is given

continue

end

end

% I now keep getting this error: Error using vertcat Dimensions of arrays being concatenated are not consistent. I'm assuming it is still an issue with one of my variables.

[Star Strider]

It’s not an issue with the variables. It’s using character arrays.

One option is to create them as string variables —

msgbox(["Correct!";"The frogs kiss your feet and you move on!"]);

msgbox(["Incorrect!";"You are attacked by frogs! Try again to gain their trust."]);

That worked when I tried it. (I omitted the icon reference since I don’t have it.)

I tried to use this .png file with a transparent background, however I couldn’t get it to work.

.

[Isobel Leikis]

i like the frog!

how did you change the variables to strings?

[Star Strider]

Thank you!

I put double quotes areound them:

"string"

'character array'

The string function will also work.

If you want to use character arrays, the sprintf function makes it easier:

msgbox(sprintf('Correct!\nThe frogs kiss your feet and you move on!'));

I tested it — that also works.

.

[Isobel Leikis]

thank you so much for your help!

[Star Strider]

As always, my pleasure!