# For loop in mathematica

## Graphs and Networks: Elementary Introduction to the Wolfram.

Details. While [ test] does the loop with a null body. If Break [] is generated in the evaluation of body, the While loop exits. Continue [] exits the evaluation of body, and continues the loop. Unless an explicit Return is used, the value returned by While is Null.

## Ray Diagrams for Lenses – Wolfram Demonstrations Project.

I'm trying to simulate the quantum Zeno effect using Mathematica and I need to apply von Neumann and projection operator on to same density matrix and in a loop one by one, it's basically switching between two evolutions in time., so I need help on how to do it. The loop counter is used to decide when the loop should terminate and for the program flow to continue to the next instruction after the loop. A common identifier naming convention is for the loop counter to use the variable names i , j , and k (and so on if needed), where i would be the most outer loop, j the next inner loop, etc. Wolfram Community forum discussion about using for loop in mathematica.. Stay on top of important topics and build connections by joining Wolfram Community groups relevant to your interests.

## How to use do, for, while loops? – Wolfram Research.

I'm having a recurring problem in mathematica when I try and introduce a simple for loop. For instance, I have the code shown below. It should increment my var value, and calculate a value of 'initial' for each 'var' value. These should then be recorded under the name RMPvalue [var] so I can combine them into a table. If I ran the code with. This video demonstrates the detailed description and basic concept of various loops such as IF loop, FOR loop and DO loop. The loops are very helpful for con. For up to three unresolved partons has been amassed in Refs. [4{12]. At the one-loop level, complete information is available for a single unresolved parton [13{16], while the case of two unresolved partons has attracted much attention [17{21]. Finally, at the two-loop level only single unresolved limits have been analysed extensively [22{26].

## Programming – For loops in Mathematica – Stack Exchange.

(2) Mathematica is case sensitive. So you'd want Print where you have print. (3) You are working too hard (I don't mean just from a Mathematica perspective, but from that of programming in general). Calculating 10! in this way should require a single loop in any language, not two (let alone three, which is what you have). The reason why I do it this way, is because your code will generate the same list every time it iterates the inner loop (which is a waste, given that the list is the same). After that, I am taking 2 random choices out of that list, then counting how many times the pair "a","a" came about. I think this is what you are doing in your code. FeynCalc is a Mathematica package for algebraic calculations in elementary particle physics. Some of the features of FeynCalc are: Passarino-Veltman reduction of one-loop amplitudes to standard scalar integrals.

## Plotting with For loop in mathematica – YouTube.

In Mathematica you can iterate over i != j with Do [<code>, {i, n}, {j, Drop [Range [n], {i}]}] In a sense it really does the actual iteration desired. The following iterates over all pairs {i, j}, although <code> is executed only for i != j. Do [If [i != j, <code>], {i, n}, {j, n}] The difference in.

## Break—Wolfram Language Documentation.

#Forloop #mathematica #equationofmotionPlotting the data from "FOR" loop in mathematica for the equation of motion. In connection to my previous question, I already have the For loop, for example, like this For[i = 1, i <= 10, i++, Plot[Sin[i*x], {x, -Pi, Pi}]]. Given this fact, I want to have something like "press any key to continue…" inside the For loop, then refresh the plot every time I press any random key. Could anybody give a complete working code?. The benefit here is that instead of comparing all values it looks for the first occurrence and ends the loop as early as possible. Or in other words, instead of asking "are two arrays equal?" it asks "is one array different from another?". 3rd by performance benchmark gFrA.

## For loops with mathematica…. – Google Groups.

Mathematica; Wolfram|Alpha Notebook Edition; Finance Platform; System Modeler; Wolfram Player;… Continue skips the rest of a loop, but resumes with the next iteration. Generates many styles of music using a one-dimensional cellular automaton. A simple interface allow the user to control various parameters. Wolfram Science. Technology-enabling science of the computational universe. Wolfram Natural Language Understanding System. Knowledge-based, broadly deployed natural language.

## Create a list that values are pulled from during a loop.

For loops can usually (and should) be avoided, since there are better constructs. In your example, it looks like i and j always have the same value, so one of them is redunant. If this is not the intention, but you want all pairs of combinations, then you can use Do: Do [ code , {i,1,3}, {j,1,2}]; Reply | Flag Reply to this discussion Reply Preview. Programming loop. There are several ways to do this in Mathematica; in this classnote, we learn the basics of programming loops. Please see the doc center section "Loops and Control Struc-tures" for more details and many examples. The "Do" Statement Suppose we want to find the sum of the first 100 integers; we know we can do this simply using. Mathematica, we input each instruction and press the “return” key. After all instructions are typed in, we press the “enter” key to execute the sequence. Individual instructions in the code can be assignment statements, iteration statements (loops), conditional (if), input or output statements, functions, or other programming constructs.

## SARAH – Hepforge.

BCT R7,LOOPI loop do i OPENEM OPEN (OUTDCB,OUTPUT) open the printer file LA R9,1 n=1 start of loop LOOPN CH R9,L do n=1 to l BH ELOOPN if n>l then exit loop SR R8,R8 m=0 LA R10,1 i=1 LR R5,R9 n SLA R5,1 n*2.

## For loop within a function in Mathematica – Stack Overflow.

This Demonstration lets you visualize the ray diagrams for converging and diverging lenses. By manipulating the object and lens locations, you can create real or virtual images. The rays parallel to the principal axis and the ray through the center of the lens are drawn.Locators allow you to drag both the object and the lens. You can change the focal length using a slider. The degree of magnificat. Wolfram U offers free open interactive courses, learning events and other educational resources for professional and technical development. Explore a range of computational fields, build your knowledge of the Wolfram Language and get certified by a world-recognized leader in technical innovation. For [start, test, incr] does the loop with a null body. The sequence of evaluation is test, body, incr. For exits as soon as test fails. If Break [] is generated in the evaluation of body, the For loop exits. Continue [] exits the evaluation of body, and continues the loop by evaluating incr. Unless an explicit Return is used, the value returned by For is Null.

## Mathematica: Problem with For loop increments | Physics Forums.

Foreach loop (or for each loop) is a control flow statement for traversing items in a collection.Foreach is usually used in place of a standard for loop statement.Unlike other for loop constructs, however, foreach loops usually maintain no explicit counter: they essentially say "do this to everything in this set", rather than "do this x times&quot. The for loop is the best loop in any programming language. In the for loop, you get a repetition control structure. It allows you to have full control to write a loop that needs to execute any number of times. The syntax of a for loop in MATLAB. for index = values <programming statements> end. Values: There can be following forms of value. Wolfram Community forum discussion about For loop with a multiple line body only executes the first line of the body. Stay on top of important topics and build connections by joining Wolfram Community groups relevant to your interests.

## PROGRAMMING IN MATHEMATICA, A PROBLEM-CENTRED APPROACH.

I'm not exactly sure what you are trying to do, but I have some confidence that the for loop is not the way to go in Mathematica. Mathematica already has pattern matching that likely eliminates the need for the loop. What about something like this. f[i_][x_,y_]:= i(x+y) or something like this. f[s_String][x_,y_]:=StringLength[s](x+y) or even.

## For Loop Problem in Mathematica | Physics Forums.

Do — evaluate an expression looping over a variable: Do [ expr, { i, n }] While — evaluate an expression while a criterion is true: While [ crit, expr] For — a "for loop": For [ init, test, incr, body] Table — build up a table by looping over variables: Table [ expr, { i, n }].

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