Array indices must be positive integers or logical values (2024)

FAQs

Array indices must be positive integers or logical values? ›

Expert-Verified Answer

It means that you are trying to access an element in an array using an index value that is not a positive integer or a logical value. In most programming languages, array indices start from 1 or 0, and thus you must use an integer value within this range.

Array indices must be positive integers or logical values.

This error occurs when you attempt to index into an array using indices that are not positive integers or logical values. Here are some tips for common situations that cause this error message: 1) Double check that your indices are positive integers. Indices in MATLAB cannot be 0, and by default, start with 1.

An index within an array is always a positive integer. Most modern languages will not allow a negative index and will generate an outside the bounds of the array error.

Indices are a way of writing numbers in a more convenient form. The index or power is the small, raised number next to a normal letter or number. It represents the number of times that normal letter or number has been multiplied by itself, for example: a² = a × a.

In Python, indexing in arrays works by assigning a numerical value to each element in the array, starting from zero for the first element and increasing by one for each subsequent element. To access a particular element in the array, you use the index number associated with that element.

Yes, it has to be an integer because you are essentially performing pointer arithmetic where &array[0] is a pointer to the beginning of the array (well, technically it has to be an integer because that's what the spec says, but this is why).

MATLAB^® represents Boolean data using the logical data type. This data type represents true and false states using the numbers 1 and 0 , respectively. Certain MATLAB functions and operators return logical values to indicate fulfillment of a condition.

Notes: The array should be initialize to be as large as the largest positive index, - the smallest negative (most negative) index.

Is it true that every integer is either positive or negative? ›

The statement `` All integers are positive or negative '' is a true statement . This is because integers are whole numbers that can be either positive , negative , or zero . Therefore , all integers fall under one of these categories .

So, the positive integers list is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, ..... and so on. 1 is the smallest positive integer and the greatest positive integer is not known as the list is endless. ► Also Check: Integers.

Zero is the integer denoted 0 that, when used as a counting number, means that no objects are present. It is the only integer (and, in fact, the only real number) that is neither negative nor positive.

Arrays must be indexed by int values; short, byte, or char values may also be used as index values because they are subjected to unary numeric promotion (§5.6. 1) and become int values.

In many programming languages (eg: JavaScript, Python, Java, C#, Clojure, etc.) you can use a negative index to select items in arrays or characters in text counting from the end of the array or string. Positive indexes count from the start. Negative indexes count from the end.

Array indexes are always integers, because at the lowest level, arrays are contiguous blocks of memory, and the array is simply represented by a pointer to its first element. The program has to perform numeric addition to this pointer to retrieve the successive element from the allocated memory.

In computer science, array indices usually start at 0 in modern programming languages, so computer programmers might use zeroth in situations where others might use first, and so forth.

Using for Loop

In this approach, we are using the for loop to iterate over each element of the array and check if each element is greater than 0, which means a positive number.

Arrays in C are a collection of values that store items of the same data type – an integer array holds only elements of the type int , a float array holds only elements of the type float , and so on.