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Print characters from list with a For-loop

Why should I avoid the For loop in Mathematica?How do I find the elements in a list that return the highest value for a function?NestList with a list inside?How to specify a specific range for a loop?How to put some values from a list into a function in a Do loopPerform For-loop and show output which meets a certain criterionHow to get Complement function working in a For loop?How to label outputs from PrintHow I can go to a new line in a nested For-loop?Iterative loop for a given listExtracting values from a list

3

$begingroup$

Suppose I have the list

primary = "b","a","e"

I want to get the following output with a For-loop (or While-loop)

"b"

"a"

"e"

My code is:

For[i = 0, i < 3, Part[primary, i], i++]

but there was no Output.

functions core-language

share|improve this question

edited May 17 at 14:58

m_goldberg

90.4k873203

asked May 17 at 14:27

Chelsea KimChelsea Kim

161

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  For loops and Print statements aren't used in Mathematica in the same way as in other languages (well, you can, but it's usually not a good idea). See here and Print or Echo.
  $endgroup$
  – Roman
  May 17 at 15:02
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Print /@ primary;
  $endgroup$
  – John Doty
  May 17 at 15:03
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  How about TableForm[primary] or Column[primary].
  $endgroup$
  – bill s
  May 17 at 19:10
  
  

  
  
  
  

add a comment | 

3

$begingroup$

Suppose I have the list

primary = "b","a","e"

I want to get the following output with a For-loop (or While-loop)

"b"

"a"

"e"

My code is:

For[i = 0, i < 3, Part[primary, i], i++]

but there was no Output.

functions core-language

share|improve this question

edited May 17 at 14:58

m_goldberg

90.4k873203

asked May 17 at 14:27

Chelsea KimChelsea Kim

161

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  For loops and Print statements aren't used in Mathematica in the same way as in other languages (well, you can, but it's usually not a good idea). See here and Print or Echo.
  $endgroup$
  – Roman
  May 17 at 15:02
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Print /@ primary;
  $endgroup$
  – John Doty
  May 17 at 15:03
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  $begingroup$
  How about TableForm[primary] or Column[primary].
  $endgroup$
  – bill s
  May 17 at 19:10
  
  

  
  
  
  

add a comment | 

$begingroup$

Suppose I have the list

primary = "b","a","e"

I want to get the following output with a For-loop (or While-loop)

"b"

"a"

"e"

My code is:

For[i = 0, i < 3, Part[primary, i], i++]

but there was no Output.

functions core-language

share|improve this question

edited May 17 at 14:58

m_goldberg

90.4k873203

asked May 17 at 14:27

Chelsea KimChelsea Kim

161

$endgroup$

primary = "b","a","e"

For[i = 0, i < 3, Part[primary, i], i++]

share|improve this question

edited May 17 at 14:58

m_goldberg

90.4k873203

asked May 17 at 14:27

Chelsea KimChelsea Kim

161

share|improve this question

edited May 17 at 14:58

m_goldberg

90.4k873203

asked May 17 at 14:27

Chelsea KimChelsea Kim

161

edited May 17 at 14:58

m_goldberg

90.4k873203

edited May 17 at 14:58

m_goldberg

90.4k873203

asked May 17 at 14:27

Chelsea KimChelsea Kim

161

asked May 17 at 14:27

Chelsea KimChelsea Kim

161

2 Answers
2

active

oldest

votes

8

$begingroup$

Some things:

1. For-loops are for effect; they always return Null, which doesn't print.


2. Your For-loop is mal-formed.


3. Mathematica arrays are 1-based, not 0-based.


4. To get printed output you need to use Print or some other function that produces an output cell.

Taking the above into consideration, the minimal correction to your code is:

For[i = 1, i <= 3, i++, Print[Part[primary, i]]]

But here is a much better way to do the same thing.

Scan[Print, primary]

This writes the each character in own output cell.

Update

Another very simple solution you might consider is

Column[primary]

This writes each character on its own line is a single output cell.

share|improve this answer

edited May 17 at 20:06

answered May 17 at 15:09

m_goldbergm_goldberg

90.4k873203

$endgroup$

add a comment | 

2

$begingroup$

You might try the code as in the following transcript:

Mathematica 10.2.0 for Microsoft Windows (32-bit)
Copyright 1988-2015 Wolfram Research, Inc.

In[1]:= primary = "b", "a", "e";

In[2]:= Map[ Print @ InputForm @ # &, primary];
"b"
"a"
"e"

In[3]:=

which seems to be what you want.

The InputForm is a print format which shows the double quotes delimiting the strings. The Print @ InputForm @ # & is an idiomatic way of defining an anonymous function which prints an exmpression using the print format. The Map[] applies the function to all the elements of the list. As usual in Mathematica there are several variant ways to do something like what you wanted to do. One variant would be to use Scan[] instead of Map[] which has the advantage that the trailing ; would not be needed. Here is another variation using Do[]

In[3]:= Do[ Print @ InputForm @ s, s , primary]
"b"
"a"
"e"

In[4]:=

share|improve this answer

edited May 17 at 17:47

answered May 17 at 17:31

SomosSomos

2,4151111

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  A slot free version is Print@*InputForm /@ primary.
  $endgroup$
  – Carl Woll
  May 17 at 17:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Carl Woll Yes, but @* is not yet defined in Mathemathica 10.2.
  $endgroup$
  – Somos
  May 17 at 17:49
  
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Are you sure? I think it was introduced in M10, and it does work in my copy of M10.
  $endgroup$
  – Carl Woll
  May 17 at 18:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @CarlWoll Actually, you are correct, but I almost never use Composition although it can be useful.
  $endgroup$
  – Somos
  May 17 at 18:12
  
  

  
  
  
  

add a comment | 

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8

$begingroup$

Some things:

1. For-loops are for effect; they always return Null, which doesn't print.


2. Your For-loop is mal-formed.


3. Mathematica arrays are 1-based, not 0-based.


4. To get printed output you need to use Print or some other function that produces an output cell.

Taking the above into consideration, the minimal correction to your code is:

For[i = 1, i <= 3, i++, Print[Part[primary, i]]]

But here is a much better way to do the same thing.

Scan[Print, primary]

This writes the each character in own output cell.

Update

Another very simple solution you might consider is

Column[primary]

This writes each character on its own line is a single output cell.

share|improve this answer

edited May 17 at 20:06

answered May 17 at 15:09

m_goldbergm_goldberg

90.4k873203

$endgroup$

add a comment | 

8

$begingroup$

Some things:

1. For-loops are for effect; they always return Null, which doesn't print.


2. Your For-loop is mal-formed.


3. Mathematica arrays are 1-based, not 0-based.


4. To get printed output you need to use Print or some other function that produces an output cell.

Taking the above into consideration, the minimal correction to your code is:

For[i = 1, i <= 3, i++, Print[Part[primary, i]]]

But here is a much better way to do the same thing.

Scan[Print, primary]

This writes the each character in own output cell.

Update

Another very simple solution you might consider is

Column[primary]

This writes each character on its own line is a single output cell.

share|improve this answer

edited May 17 at 20:06

answered May 17 at 15:09

m_goldbergm_goldberg

90.4k873203

$endgroup$

add a comment | 

$begingroup$

Some things:

1. For-loops are for effect; they always return Null, which doesn't print.


2. Your For-loop is mal-formed.


3. Mathematica arrays are 1-based, not 0-based.


4. To get printed output you need to use Print or some other function that produces an output cell.

Taking the above into consideration, the minimal correction to your code is:

For[i = 1, i <= 3, i++, Print[Part[primary, i]]]

But here is a much better way to do the same thing.

Scan[Print, primary]

This writes the each character in own output cell.

Update

Another very simple solution you might consider is

Column[primary]

This writes each character on its own line is a single output cell.

share|improve this answer

edited May 17 at 20:06

answered May 17 at 15:09

m_goldbergm_goldberg

90.4k873203

$endgroup$

For[i = 1, i <= 3, i++, Print[Part[primary, i]]]

Scan[Print, primary]

Column[primary]

share|improve this answer

edited May 17 at 20:06

answered May 17 at 15:09

m_goldbergm_goldberg

90.4k873203

answered May 17 at 15:09

m_goldbergm_goldberg

90.4k873203

answered May 17 at 15:09

m_goldbergm_goldberg

90.4k873203

2

$begingroup$

You might try the code as in the following transcript:

Mathematica 10.2.0 for Microsoft Windows (32-bit)
Copyright 1988-2015 Wolfram Research, Inc.

In[1]:= primary = "b", "a", "e";

In[2]:= Map[ Print @ InputForm @ # &, primary];
"b"
"a"
"e"

In[3]:=

which seems to be what you want.

The InputForm is a print format which shows the double quotes delimiting the strings. The Print @ InputForm @ # & is an idiomatic way of defining an anonymous function which prints an exmpression using the print format. The Map[] applies the function to all the elements of the list. As usual in Mathematica there are several variant ways to do something like what you wanted to do. One variant would be to use Scan[] instead of Map[] which has the advantage that the trailing ; would not be needed. Here is another variation using Do[]

In[3]:= Do[ Print @ InputForm @ s, s , primary]
"b"
"a"
"e"

In[4]:=

share|improve this answer

edited May 17 at 17:47

answered May 17 at 17:31

SomosSomos

2,4151111

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  A slot free version is Print@*InputForm /@ primary.
  $endgroup$
  – Carl Woll
  May 17 at 17:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Carl Woll Yes, but @* is not yet defined in Mathemathica 10.2.
  $endgroup$
  – Somos
  May 17 at 17:49
  
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Are you sure? I think it was introduced in M10, and it does work in my copy of M10.
  $endgroup$
  – Carl Woll
  May 17 at 18:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @CarlWoll Actually, you are correct, but I almost never use Composition although it can be useful.
  $endgroup$
  – Somos
  May 17 at 18:12
  
  

  
  
  
  

add a comment | 

2

$begingroup$

You might try the code as in the following transcript:

Mathematica 10.2.0 for Microsoft Windows (32-bit)
Copyright 1988-2015 Wolfram Research, Inc.

In[1]:= primary = "b", "a", "e";

In[2]:= Map[ Print @ InputForm @ # &, primary];
"b"
"a"
"e"

In[3]:=

which seems to be what you want.

The InputForm is a print format which shows the double quotes delimiting the strings. The Print @ InputForm @ # & is an idiomatic way of defining an anonymous function which prints an exmpression using the print format. The Map[] applies the function to all the elements of the list. As usual in Mathematica there are several variant ways to do something like what you wanted to do. One variant would be to use Scan[] instead of Map[] which has the advantage that the trailing ; would not be needed. Here is another variation using Do[]

In[3]:= Do[ Print @ InputForm @ s, s , primary]
"b"
"a"
"e"

In[4]:=

share|improve this answer

edited May 17 at 17:47

answered May 17 at 17:31

SomosSomos

2,4151111

$endgroup$

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  A slot free version is Print@*InputForm /@ primary.
  $endgroup$
  – Carl Woll
  May 17 at 17:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @Carl Woll Yes, but @* is not yet defined in Mathemathica 10.2.
  $endgroup$
  – Somos
  May 17 at 17:49
  
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  Are you sure? I think it was introduced in M10, and it does work in my copy of M10.
  $endgroup$
  – Carl Woll
  May 17 at 18:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @CarlWoll Actually, you are correct, but I almost never use Composition although it can be useful.
  $endgroup$
  – Somos
  May 17 at 18:12
  
  

  
  
  
  

add a comment | 

$begingroup$

You might try the code as in the following transcript:

Mathematica 10.2.0 for Microsoft Windows (32-bit)
Copyright 1988-2015 Wolfram Research, Inc.

In[1]:= primary = "b", "a", "e";

In[2]:= Map[ Print @ InputForm @ # &, primary];
"b"
"a"
"e"

In[3]:=

which seems to be what you want.

The InputForm is a print format which shows the double quotes delimiting the strings. The Print @ InputForm @ # & is an idiomatic way of defining an anonymous function which prints an exmpression using the print format. The Map[] applies the function to all the elements of the list. As usual in Mathematica there are several variant ways to do something like what you wanted to do. One variant would be to use Scan[] instead of Map[] which has the advantage that the trailing ; would not be needed. Here is another variation using Do[]

In[3]:= Do[ Print @ InputForm @ s, s , primary]
"b"
"a"
"e"

In[4]:=

share|improve this answer

edited May 17 at 17:47

answered May 17 at 17:31

SomosSomos

2,4151111

$endgroup$

Mathematica 10.2.0 for Microsoft Windows (32-bit)
Copyright 1988-2015 Wolfram Research, Inc.

In[1]:= primary = "b", "a", "e";

In[2]:= Map[ Print @ InputForm @ # &, primary];
"b"
"a"
"e"

In[3]:=

In[3]:= Do[ Print @ InputForm @ s, s , primary]
"b"
"a"
"e"

In[4]:=

share|improve this answer

edited May 17 at 17:47

answered May 17 at 17:31

SomosSomos

2,4151111

answered May 17 at 17:31

SomosSomos

2,4151111

answered May 17 at 17:31

SomosSomos

2,4151111