ssrs barcode font download StringDrop eliminates characters from a string. There are five forms of this command. in Software

Creation QR Code in Software StringDrop eliminates characters from a string. There are five forms of this command.

StringDrop eliminates characters from a string. There are five forms of this command.
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StringDrop[string, n] returns string with its first n characters dropped. StringDrop[string, n] returns string with its last n characters dropped. StringDrop[string, {n}] returns string with its nth character dropped. StringDrop[string, { n}] returns string with the nth character from the end dropped. StringDrop[string, {m, n}] returns string with characters m through n dropped.
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StringTake returns characters from a string. Its format is similar to StringDrop.
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StringTake[string, n] returns the first n characters of string. StringTake[string, n] returns the last n characters of string. StringTake[string, {n}] returns the nth character of string. StringTake[string, { n}] returns the nth character from the end of string. StringTake[string, {m, n}] returns characters m through n of string.
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EXAMPLE 35 In this example we define string = "abcdefg". The output is shown to the right of the command. (Please observe the difference between the Mathematica symbol String and the user-defined symbol string.)
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string = "abcdefg" string <> "hijklmnop" StringLength[string] StringReverse[string] StringDrop[string, 2] StringDrop[string, 2] StringDrop[string, {2}] StringDrop[string, { 2}] StringDrop[string, {2, 5}] StringTake[string, 2] StringTake[string, 2] StringTake[string, {2}] StringTake[string,
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abcdefg abcdefghijklmnop 7 gfedcba cdefg abcde acdefg abcdeg afg ab fg b f bcde
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StringTake[string, {2, 5}]
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StringInsert allows you to insert characters within existing strings.
StringInsert[string1, string2, n] yields a string with string2 inserted starting at position n in string1. StringInsert[string1, string2, n] yields a string with string2 inserted starting at the nth position from the end of string1. StringInsert[string1, string2, {n1, n2,...}] inserts a copy of string2 at each of the positions n1, n2, . . . of string1.
StringReplace allows you to replace part of a string with another string.
StringReplace[string, string1 newstring1] replaces string1 by newstring1 whenever it appears in string. StringReplace[string, {string1 newstring1, string2 newstring2, . . .}] replaces string1 by newstring1, string2 by newstring2, . . . whenever they appear in string. StringPosition[string, substring] returns a list of the start and end positions of all occurrances of substring within string. (Lists are discussed in detail in 3.)
EXAMPLE 36
string1 = "abcdefg"; string2 = "123"; StringInsert[string1,string2, 3] ab123cdefg StringInsert[string1, string2, 3] abcde123fg StringInsert[string1, string2, {1, 3, 5, 7}] 123ab123cd123ef123g StringReplace[string1, "ab" "AB"] ABcdefg StringReplace[string1, {"ab" "AB", "fg" "FG"}] ABcdeFG
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EXAMPLE 37
string = "abcxabcxxabcxxxabc"; StringLength[string] 18 StringPosition[string, "abc"] {{1, 3}, {5, 7}, {10, 12}, {16, 18}}
2.5 Assignment and Replacement
All programming languages must have the ability to make assignments in order to transfer the result of a calculation to a symbol which can be recalled for later use. Mathematica offers two types of assignment and there is often confusion as to which one to use in a given situation.
lhs = rhs is an immediate assignment in which rhs is evaluated at the time the assignment is made. lhs rhs is a delayed assignment in which rhs is evaluated each time the value of lhs is called.
In many situations both assignments produce identical results. There are, however, a few instances where one must be careful. The following examples use ideas that are discussed in later chapters. They are self-explanatory, however, and will be easily understood.
EXAMPLE 38 When defining functions recursively, must be used. For example,
f[0]= 1; f[n_] n f[n 1] produces n factorial. Since Mathematica cannot compute f[n] until the value of n is specified, the delayed assignment, , must be used. Using = causes recursion errors. f[5] 120 f[10]
3 628 800
EXAMPLE 39 When defining piecewise functions, one must use . For example,
g[x_] x2 /; x 0 g[x_] x /; x < 0 g[3] 9 g[ 3] 9
/; is a conditional. Assignment will be made only if x 0.
Using = would cause trouble, as Mathematica cannot determine which branch should be taken until a value of x is supplied.
EXAMPLE 40 You may think that the assignment is more general and can be safely used in any given situation. This is true to a certain extent, but there are times when one should use =. As an extreme, but reasonable, example, let us define
F[x_]:= t Exp[t] Sin[t] t 0
Each time a value of F is computed, Mathematica performs several integration by parts evaluations. Now imagine that many different values of F are needed, for example in the instruction
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