## Summation index must be a symbolic variable

7.3 Solving equations of symbolic variables . Try out the command window, the easiest way to use command window is to think of it simply as a normal 2 Jan 2017 Symbolic variables, called symbols, must be defined and assigned to Python variables before summation and product expressions are convergent, Available at http:// www.vttoth.com/ CMS/ index.php/ technical-notes/ 67. GAMS uses the traditional symbols for addition (+) , subtraction (-) The extension to two or more controlling indices should be obvious. It is also possible to sum simultaneously over the domain of two or more sets as in the first In the context of equation definitions, scalars, parameters and variables may appear freely in Symbolic Math Toolbox™ provides two functions for calculating sums: sum finds the sum of elements of symbolic vectors and matrices. Unlike the MATLAB ® sum, the symbolic sum function does not work on multidimensional arrays. For details, follow the MATLAB sum page. symsum finds the sum of a symbolic series. If you do not specify k, symsum uses the variable determined by symvar as the summation index. If f is a constant, then the default variable is x. symsum(f,k,[a b]) or symsum(f,k,[a; b]) is equivalent to symsum(f,k,a,b).

## Represents a summation of the values of expr as the index i varies from i_0 to i_1 . The noun form 'sum is displayed as an uppercase letter sigma. sum evaluates its summand expr and lower and upper limits i_0 and i_1, sum quotes (does not evaluate) the index i . If the upper and lower limits differ by an integer,

7.3 Solving equations of symbolic variables . Try out the command window, the easiest way to use command window is to think of it simply as a normal 2 Jan 2017 Symbolic variables, called symbols, must be defined and assigned to Python variables before summation and product expressions are convergent, Available at http:// www.vttoth.com/ CMS/ index.php/ technical-notes/ 67. GAMS uses the traditional symbols for addition (+) , subtraction (-) The extension to two or more controlling indices should be obvious. It is also possible to sum simultaneously over the domain of two or more sets as in the first In the context of equation definitions, scalars, parameters and variables may appear freely in Symbolic Math Toolbox™ provides two functions for calculating sums: sum finds the sum of elements of symbolic vectors and matrices. Unlike the MATLAB ® sum, the symbolic sum function does not work on multidimensional arrays. For details, follow the MATLAB sum page. symsum finds the sum of a symbolic series.

### The variable of summation is represented by an index which is placed beneath the summation sign. The index is often represented by i. (Other common possibilities for representation of the index are j and t.) The index appears as the expression i = 1. The index assumes values starting with the value on the right hand side of the equation and ending with the value above the summation sign.

I think that Matlab's symbolic core uses Maple's implementation or something like that. If you can do something in Maple, then you should be able to do that in symbolic Matlab. Unfortunately, I do not know much of Maple or Mathematica. – jespestana Oct 15 '12 at 13:10 In general, you can use sym or syms to create symbolic variables. We recommend you use syms because it requires less typing. Note To create a symbolic expression that is a constant, you must use the sym command. For example, to create the expression whose value is 5, enter f = sym('5'). Note that the command f = 5 does not define f as a symbolic The variable of summation is represented by an index which is placed beneath the summation sign. The index is often represented by i. (Other common possibilities for representation of the index are j and t.) The index appears as the expression i = 1. The index assumes values starting with the value on the right hand side of the equation and ending with the value above the summation sign. The summation operator is used to indicate that a set of values should be added together. The formulas used to compute moments for a probability distribution are based on the summation operator. This is because each calculation must be repeated for each possible value of a random variable and the results must be summed. In mathematics, summation is the addition of a sequence of any kind of numbers, called addends or summands; the result is their sum or total. Besides numbers, other types of values can be summed as well: functions, vectors, matrices, polynomials and, in general, elements of any types of mathematical objects on which It successfully sums the field for numeric data, however when I run the application and want to sum company code, which is the first item in my drop down, it gives me the following error; A variable index must be a real positive integer. The summation convention requires that one must never allow a summation index to appear more than twice in any given expression. Because of this rule it is sometimes necessary to replace one dummy summation symbol by some other dummy symbol in order to avoid having three or more indices occurring on the same side of the equation. The index notation is a very powerful notation and can be used to concisely represent many complex equations.

### Subscript indices must either be real positive integers or logicals I have found many questions about this but not one with a really generic answer. Hence I would like to have the general solution for dealing with this problem.

Array indices must be positive integers or logical values. According to the documentation of symsum , the variable for range ( i in your case should be a symbolic variable). You haven't defined i as a symbolic variable and hence it is considered to To do your intended operation, I would use sum like this: The sym command lets you construct symbolic variables and expressions. For example Note To create a symbolic expression that is a constant, you must use the double-precision floating point number to a sum of two binary numbers, in the now be manipulated by field and index to access a particular portion of the. The problem is final graph of 'summ' should be equal or less than amplitude of ' deltaHvec'. But I am getting Because the index variable is same for both the summations. The symbolic tool box can be used for single summation. I tried to The purpose of this document is to explain the features of MATLAB that are useful for applying the techniques Summation index must be a symbolic variable. Symbolic variables are treated differently than regular variables in Matlab and must be created using the sym() or syms() functions. syms A B lambda X Y The end index can be inf, in which case an infinite sum is performed. symsum(2^(-X), 0 When defining a function, ensure that the arguments are symbolic variables and the body of the function is a SYM expression. When indexing, the input must be

## Symbolic Math Toolbox™ provides two functions for calculating sums: sum finds the sum of elements of symbolic vectors and matrices. Unlike the MATLAB ® sum, the symbolic sum function does not work on multidimensional arrays. For details, follow the MATLAB sum page. symsum finds the sum of a symbolic series.

If you do not specify k, symsum uses the variable determined by symvar as the summation index. If f is a constant, then the default variable is x. symsum(f,k,[a b]) or symsum(f,k,[a; b]) is equivalent to symsum(f,k,a,b). In mathematics, summation is the addition of a sequence of any kind of numbers, called addends or summands; the result is their sum or total. Besides numbers, other types of values can be summed as well: functions, vectors, matrices, polynomials and, in general, elements of any types of mathematical objects on which In using the summation symbol, take note of the following: An index variable is just a “dummy” variable. It means that you can use a different index variable without changing the value of the sum. The sum is the same as and is the same as. Here, the dummy variable is , the lower limit of summation is 1, and the upper limit is 5. Example. Sometimes, you will see summation signs with no dummy variable specified, e.g., ∑ = In such cases the correct dummy variable should be clear from the context.

Symbolic Math Toolbox™ provides two functions for calculating sums: sum finds the sum of elements of symbolic vectors and matrices. Unlike the MATLAB ® sum, the symbolic sum function does not work on multidimensional arrays. For details, follow the MATLAB sum page. symsum finds the sum of a symbolic series. If you do not specify k, symsum uses the variable determined by symvar as the summation index. If f is a constant, then the default variable is x. symsum(f,k,[a b]) or symsum(f,k,[a; b]) is equivalent to symsum(f,k,a,b). In mathematics, summation is the addition of a sequence of any kind of numbers, called addends or summands; the result is their sum or total. Besides numbers, other types of values can be summed as well: functions, vectors, matrices, polynomials and, in general, elements of any types of mathematical objects on which In using the summation symbol, take note of the following: An index variable is just a “dummy” variable. It means that you can use a different index variable without changing the value of the sum. The sum is the same as and is the same as.