determining if characters are alphabetic

[paraphrasing question that was edited out of existence]

I have a homework assignment. I have to use loops to figure out whether characters are alphabetic. Then I have to do the task again, but using vectorization. Please write a function for me that does this homework.

[Image Analyst]

They're not allowed to delete once someone has responded.

[steve koi]

where can i delete question though, i cant find it anywhere. i thought it would be under edit

[Jan]

@Steve: You cannot and should not delete a question. If a student or pupil asks a homework question, it is intended, that the teachers/professors find this question together with its answers. Otherwise the forum would be full of homework cheaters.

Image Analyst has explaines this already, see above.

Answer 1

[Star Strider]

I suggest using isletter:

   notletter = ~isletter(A);

I am not sure what you want to do, but isletter can take a string array, so in that sense it would be vectorized.

[steve koi]

I have been trying to figure out the problem above using a loop. And then doing the problem again seperatley using vectorization. I need the code for both cuz I just can't figure it ouy

[Star Strider]

Please post the code you have written, what you want your code to do, and describe why it is not working the way you want it to.

[Ryan]

Look through your notes/book/Matlab help online to figure out how to:

• Create a function
• Pass variables to and from the function
• Identify data types
• Loops and vectorization

If this is a review problem you should be able to at least provide a start to the code.

[Star Strider]

Thank you Ryan. I agree.

Michael Richard: if you want to reverse-engineer isletter, see the documentation for isletter — particularly the links and references at the end of that documentation — and the various ways MATLAB denotes integers. This seems to be a homework assignment, so I'll leave it at that.

Answer 2

[Sean de Wolski]

s = 'Hello World it''s 1129 on Monday August 27th';

%With for-loop
for ii = 1:1
    sletters = s(isstrprop(s,'alpha'));
end

%Vectorized
sletters2 = s(isstrprop(s,'alpha'));