HELP ME PLEASE??

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SULE SAHIN
SULE SAHIN 2017-11-6
评论： Walter Roberson 2018-4-27
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
  4 个评论
显示 2更早的评论
SULE SAHIN
SULE SAHIN 2017-11-6
编辑：Walter Roberson 2017-11-6
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
Walter Roberson 2018-4-27
Please do not close questions that have an answer.

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回答（1 个）

Walter Roberson
Walter Roberson 2017-11-6
You are only returning the signed integer classes. You have forgotten the unsigned integer classes like uint8
  2 个评论
SULE SAHIN
SULE SAHIN 2017-11-6
编辑：Walter Roberson 2017-11-6
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
Steven Lord 2017-11-6
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?

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