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

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What does array indices must be positive, integers, or logical values? ›

Expert-Verified Answer

This means that the first element of an array has an index of 1, not 0 as in some other programming languages. When accessing elements of an array, one must use positive integers to specify the position of the element within the array.

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.

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.

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.

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.

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.

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 .

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.

Negative indexing allows accessing array elements relative to the end of the array rather than the beginning. For example, in Python, index -1 refers to the last element, -2 refers to second last, and so on.

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.

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.

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.