HELP ME PLEASE??

Write a function called integerize that takes as its input a matrix A of integers of type double, and returns the name of the “smallest” signed integer class to which A can be converted without loss of information. If no such class exists, the text 'NONE' is returned. For example, if the smallest element of A is -100 and the largest is +100, then the function would return 'int8'. As another example, if there is an element of A equal to -1e20, then the function would return 'NONE'

My code is;

function x = integerize(A)
    maxA = max(A(:));
    minA = min(A(:));

    if maxA<=((2^7)-1) && minA>=-(2^7);
        x='int8';

      elseif maxA<=((2^15)-1) && maxA>((2^7)-1) && minA>=-(2^15) && minA< -(2^7);
          x='int16';

      elseif maxA<=((2^31)-1) && maxA>((2^15)-1) && minA >=-(2^31) && minA <-(2^15);
          x='int32';

      elseif maxA<=((2^63)-1) && maxA>((2^31)-1) && minA >=-(2^63) && minA< -(2^31);
        x='int64';
      else
          x=NONE;
      end
  end

But it is noncorrect;

Problem 1 (integerize):
                                       Testing with argument(s) 0
    Feedback: Your function performed correctly for argument(s) 0
                                       Testing with argument(s) 1
    Feedback: Your function performed correctly for argument(s) 1
                                       Testing with argument(s) -1
    Feedback: Your function performed correctly for argument(s) -1
                                       Testing with argument(s) -127
    Feedback: Your function performed correctly for argument(s) -127
                                       Testing with argument(s) -128
    Feedback: Your function performed correctly for argument(s) -128
                                       Testing with argument(s) 126
    Feedback: Your function performed correctly for argument(s) 126
                                       Testing with argument(s) 127
    Feedback: Your function performed correctly for argument(s) 127
                                       Testing with argument(s) 128
    Feedback: Your program made an error for argument(s) 128

Your solution is _not_ correct.

I dont understant my fault pleas help me

[Geoff Hayes]

Sule - is this homework? Are you submitting your code (somewhere) and it evaluates it giving you the Problem 1 (integerize): Testing with argument(s) 0 Feedback: Your function pe.... What are the inputs to your function for each test case?

[Stephen23]

https://www.mathworks.com/matlabcentral/answers/342027-write-a-function-called-integerize-that-takes-as-its-input-a-matrix-a-of-integers-of-type-double-an

[SULE SAHIN]

What is the problem? My code is;

function x = integerize(A)
    maxA = max(A(:));
    minA = min(A(:));

    if maxA<=((2^7)-1) && minA>=-(2^7);
        x='int8';
      elseif maxA<=((2^15)-1) && maxA>((2^7)-1) && minA>=-(2^15) && minA< -(2^7);
          x='int16';
      elseif maxA<=((2^31)-1) && maxA>((2^15)-1) && minA >=-(2^31) && minA <-(2^15);
          x='int32';
      elseif maxA<=((2^63)-1) && maxA>((2^31)-1) && minA >=-(2^63) && minA< -(2^31);
        x='int64';
    elseif maxA<= ((2^8)-1) && minA >= 0;
        x = 'uint8';
    elseif maxA<= ((2^16)-1) && maxA >((2^8)-1);
        x = 'uint16';
    elseif maxA<= ((2^32)-1) maxA > ((2^16)-1) ;
        x = 'uint32';
    elseif maxA<= ((2^64)-1) && maxA > ((2^32)-1) ;
        x = 'uint64';
    else
          x=NONE;
      end
  end

But , it is wrong too.

[Walter Roberson]

Please do not close questions that have an answer.

Answer 1

[Walter Roberson]

You are only returning the signed integer classes. You have forgotten the unsigned integer classes like uint8

[SULE SAHIN]

function x = integerize(A)
    maxA = max(A(:));
    minA = min(A(:));

    if maxA<=((2^7)-1) && minA>=-(2^7);
        x='int8';
      elseif maxA<=((2^15)-1) && maxA>((2^7)-1) && minA>=-(2^15) && minA< -(2^7);
          x='int16';
      elseif maxA<=((2^31)-1) && maxA>((2^15)-1) && minA >=-(2^31) && minA <-(2^15);
          x='int32';
      elseif maxA<=((2^63)-1) && maxA>((2^31)-1) && minA >=-(2^63) && minA< -(2^31);
        x='int64';
    elseif maxA<= ((2^8)-1) && minA >= 0;
        x = 'uint8';
    elseif maxA<= ((2^16)-1) && minA >= 0;
        x = 'uint16';
    elseif maxA<= ((2^32)-1) && minA >= 0;
        x = 'uint32';
    elseif maxA<= ((2^64)-1) && minA >= 0;
        x = 'uint64';
    else
          x=NONE;
      end
  end

but;

Undefined function or variable 'NONE'.

Error in integerize (line 22)
        x=NONE;

[Steven Lord]

That's correct, there is no function named NONE in MATLAB or any MathWorks products and no variable by that name in your code. But reread the homework assignment carefully -- in the case where none of the integer types fit, what exactly should be returned? What type should that return value be?