Sfrgttk

Eww, those bytes are gross

Avoiding morning and evening handshakes

What is the meaning of "pick up" in this sentence?

Cyclical Argument in Plato's Phaedo

Find the number of ways to express 1050 as sum of consecutive integers

Why are some book titles not capitalized?

Finding ratio of the area of triangles

Called into a meeting and told we are being made redundant (laid off) and "not to share outside". Can I tell my partner?

Activating a Alphanet Faucet Wallet Remotely (without tezos-client)

Connecting top and bottom of adjacent circles

Where is this triangular-shaped space station from?

Am I a Rude Number?

How can I introduce myself to a party without saying that I am a rogue?

What's the rationale behind the objections to these measures against human trafficking?

What was the population of late Pre-Islamic Arabia and the population of Arabic speakers before Islam?

Can the Count of Monte Cristo's calculation of poison dosage be explained?

Getting a matrix of complex values from associations giving the real and imaginary parts of each element?

Emit zero-width bash prompt sequence from external binary

What to do when being responsible for data protection in your lab, yet advice is ignored?

Could be quantum mechanics necessary to analyze some biology scenarios?

Why is working on the same position for more than 15 years not a red flag?

Which branches of mathematics can be done just in terms of morphisms and composition?

How large should photos on my blog be?

Protecting the tops of deck joists - or not?

For Loop and Sum

Why should I avoid the For loop in Mathematica?How to solve a problem in relative motion?FindFit giving weird values on a logistic equationReplace notebooks and pens with Mathematica?Module that prints first m positive odd integers and returns the square root of the sum of themTrouble defining function for homeworkVariable Increments in a TableWhat is p[a] forInfinite While loopAn efficient way to translate a triple for-loop from Matlab to MathematicaPlotting gradient and newton directions for parametric system of nonlinear ODEs

1

$begingroup$

I am requested to do a sum of the first fifty positive even numbers by using For loop.
The For loop that I created is

For[natNum = 2, natNum <= 50, natNum = natNum + 2, Print[natNum]]

The output of this is a list of numbers from 2 to 50 and they are increasing by 2. Now I need these numbers to be sum so I created

Sum[For[natNum = 2, natNum <= 50, natNum = natNum + 2, Print[natNum]]] 

However, it is not a correct input. I am not sure if I should write the Sum inside the For loop.

homework

share|improve this question

edited 43 mins ago

MarcoB

36.6k556112

asked 3 hours ago

Laura FigueroaLaura Figueroa

61

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  If this is a class assignment, I'd suggest withdrawing from the class. For loops are almost never a good way to do anything in Mathematica.
  $endgroup$
  – John Doty
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  If you want the first 50 positive even numbers, I believe that is {2, 4, ..., 100}. The sum is (2+100) + (4+98) + ... + (50 + 52) = 102 * 25 = 2550.
  $endgroup$
  – mjw
  1 hour ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Total@Range[2, 2*50, 2] would be pretty direct. Note also that Print prints its arguments, but does not return them (in fact, it returns Null).
  $endgroup$
  – MarcoB
  37 mins ago
  
  
  

  
  
  
  

add a comment | 

1

$begingroup$

I am requested to do a sum of the first fifty positive even numbers by using For loop.
The For loop that I created is

For[natNum = 2, natNum <= 50, natNum = natNum + 2, Print[natNum]]

The output of this is a list of numbers from 2 to 50 and they are increasing by 2. Now I need these numbers to be sum so I created

Sum[For[natNum = 2, natNum <= 50, natNum = natNum + 2, Print[natNum]]] 

However, it is not a correct input. I am not sure if I should write the Sum inside the For loop.

homework

share|improve this question

edited 43 mins ago

MarcoB

36.6k556112

asked 3 hours ago

Laura FigueroaLaura Figueroa

61

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  If this is a class assignment, I'd suggest withdrawing from the class. For loops are almost never a good way to do anything in Mathematica.
  $endgroup$
  – John Doty
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  If you want the first 50 positive even numbers, I believe that is {2, 4, ..., 100}. The sum is (2+100) + (4+98) + ... + (50 + 52) = 102 * 25 = 2550.
  $endgroup$
  – mjw
  1 hour ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Total@Range[2, 2*50, 2] would be pretty direct. Note also that Print prints its arguments, but does not return them (in fact, it returns Null).
  $endgroup$
  – MarcoB
  37 mins ago
  
  
  

  
  
  
  

add a comment | 

$begingroup$

I am requested to do a sum of the first fifty positive even numbers by using For loop.
The For loop that I created is

For[natNum = 2, natNum <= 50, natNum = natNum + 2, Print[natNum]]

The output of this is a list of numbers from 2 to 50 and they are increasing by 2. Now I need these numbers to be sum so I created

Sum[For[natNum = 2, natNum <= 50, natNum = natNum + 2, Print[natNum]]] 

However, it is not a correct input. I am not sure if I should write the Sum inside the For loop.

homework

share|improve this question

edited 43 mins ago

MarcoB

36.6k556112

asked 3 hours ago

Laura FigueroaLaura Figueroa

61

$endgroup$

For[natNum = 2, natNum <= 50, natNum = natNum + 2, Print[natNum]]

Sum[For[natNum = 2, natNum <= 50, natNum = natNum + 2, Print[natNum]]] 

share|improve this question

edited 43 mins ago

MarcoB

36.6k556112

asked 3 hours ago

Laura FigueroaLaura Figueroa

61

share|improve this question

edited 43 mins ago

MarcoB

36.6k556112

asked 3 hours ago

Laura FigueroaLaura Figueroa

61

edited 43 mins ago

MarcoB

36.6k556112

edited 43 mins ago

MarcoB

36.6k556112

asked 3 hours ago

Laura FigueroaLaura Figueroa

61

asked 3 hours ago

Laura FigueroaLaura Figueroa

61

2 Answers
2

active

oldest

votes

3

$begingroup$

Anyone asking you to write For loops in Mathematica for such a problem is a dolt. Nevertheless, here's how you might do that:

rslt = 0;

For[i = 0, i <= 50, i += 2, rslt += i];

rslt

And here's how someone with some familiarity with Mathematica might write it

Plus @@ Range[25]*2

Now, spend the time you were going to waste writing a For loop by reading the answers to this question Why should I avoid the For loop in Mathematica?

share|improve this answer

answered 2 hours ago

High Performance MarkHigh Performance Mark

528411

$endgroup$

add a comment | 

0

$begingroup$

The first fifty positive integers can be computed with Table:

Q = 0; (* Initialization)

T = Table[Q + k, {k, 2 Range[50]}]

We can sum up the values of T with Sum:

Sum[T[[k]], {k, Range[50]}]

2550

share|improve this answer

answered 1 hour ago

mjwmjw

3566

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Perhaps better / more idiomatic than your Sum approach would be using Total[T] or Plus@@T.
  $endgroup$
  – MarcoB
  38 mins ago
  

  
  
  
  

add a comment | 

Your Answer

StackExchange.ifUsing("editor", function () {
return StackExchange.using("mathjaxEditing", function () {
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
});
});
}, "mathjax-editing");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "387"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmathematica.stackexchange.com%2fquestions%2f192541%2ffor-loop-and-sum%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

3

$begingroup$

Anyone asking you to write For loops in Mathematica for such a problem is a dolt. Nevertheless, here's how you might do that:

rslt = 0;

For[i = 0, i <= 50, i += 2, rslt += i];

rslt

And here's how someone with some familiarity with Mathematica might write it

Plus @@ Range[25]*2

Now, spend the time you were going to waste writing a For loop by reading the answers to this question Why should I avoid the For loop in Mathematica?

share|improve this answer

answered 2 hours ago

High Performance MarkHigh Performance Mark

528411

$endgroup$

add a comment | 

3

$begingroup$

Anyone asking you to write For loops in Mathematica for such a problem is a dolt. Nevertheless, here's how you might do that:

rslt = 0;

For[i = 0, i <= 50, i += 2, rslt += i];

rslt

And here's how someone with some familiarity with Mathematica might write it

Plus @@ Range[25]*2

Now, spend the time you were going to waste writing a For loop by reading the answers to this question Why should I avoid the For loop in Mathematica?

share|improve this answer

answered 2 hours ago

High Performance MarkHigh Performance Mark

528411

$endgroup$

add a comment | 

$begingroup$

Anyone asking you to write For loops in Mathematica for such a problem is a dolt. Nevertheless, here's how you might do that:

rslt = 0;

For[i = 0, i <= 50, i += 2, rslt += i];

rslt

And here's how someone with some familiarity with Mathematica might write it

Plus @@ Range[25]*2

Now, spend the time you were going to waste writing a For loop by reading the answers to this question Why should I avoid the For loop in Mathematica?

share|improve this answer

answered 2 hours ago

High Performance MarkHigh Performance Mark

528411

$endgroup$

rslt = 0;

For[i = 0, i <= 50, i += 2, rslt += i];

rslt

Plus @@ Range[25]*2

share|improve this answer

answered 2 hours ago

High Performance MarkHigh Performance Mark

528411

answered 2 hours ago

High Performance MarkHigh Performance Mark

528411

answered 2 hours ago

High Performance MarkHigh Performance Mark

528411

0

$begingroup$

The first fifty positive integers can be computed with Table:

Q = 0; (* Initialization)

T = Table[Q + k, {k, 2 Range[50]}]

We can sum up the values of T with Sum:

Sum[T[[k]], {k, Range[50]}]

2550

share|improve this answer

answered 1 hour ago

mjwmjw

3566

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Perhaps better / more idiomatic than your Sum approach would be using Total[T] or Plus@@T.
  $endgroup$
  – MarcoB
  38 mins ago
  

  
  
  
  

add a comment | 

0

$begingroup$

The first fifty positive integers can be computed with Table:

Q = 0; (* Initialization)

T = Table[Q + k, {k, 2 Range[50]}]

We can sum up the values of T with Sum:

Sum[T[[k]], {k, Range[50]}]

2550

share|improve this answer

answered 1 hour ago

mjwmjw

3566

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Perhaps better / more idiomatic than your Sum approach would be using Total[T] or Plus@@T.
  $endgroup$
  – MarcoB
  38 mins ago
  

  
  
  
  

add a comment | 

$begingroup$

The first fifty positive integers can be computed with Table:

Q = 0; (* Initialization)

T = Table[Q + k, {k, 2 Range[50]}]

We can sum up the values of T with Sum:

Sum[T[[k]], {k, Range[50]}]

2550

share|improve this answer

answered 1 hour ago

mjwmjw

3566

$endgroup$

Q = 0; (* Initialization)

T = Table[Q + k, {k, 2 Range[50]}]

Sum[T[[k]], {k, Range[50]}]

share|improve this answer

answered 1 hour ago

mjwmjw

3566

answered 1 hour ago

mjwmjw

3566

answered 1 hour ago

mjwmjw

3566