# Questions tagged [concatenation]

Questions on how to concatenate/join/merge lists/arrays of symbols/numbers/strings/etc. to obtain a given form of the output.

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New to Mathematica. I want to create and combine K1, K2, and K3 (shown in the first picture below) into the 8x8 matrix shown in the second picture below and keep the heading as shown if possible: ...
• 13
1 vote
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### How to use 'Join' and '& /@' : combining all .csv files in a directory into a single .csv file automatically

I would like to import all .csv files in a directory and combine them into a single file using Join. I can do this manually but when I try to automate it using <...
• 75
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### Convert a list to an integer

How can we convert a list to an integer correctly? {5, 22, 4, 5} -> 52245? When I use the command FromDigits in Mathematica ...
• 1,756
410 views

### How to join many tables side by side?

I have function for table $t$ t[n_] := Table[i*n, {i, 1, 3}]; For example t[1]=(1, 2, 3), t[2]=(2, 4, 6), and t[3]=(3, 6, 9) To join $n=3$ tables side by side ...
• 711
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### Build a new flat list from a mix of part items and part spans

I want to modify a list of table row by adding an extra column. For that I Map the data with a pure function that evluate the new column value from exisiting one ...
• 1,459
83 views

### What's the easiest way to combine specific columns of two matrices?

given matrices A = {{3, 10, 10, 5.}, {4, 10, 10, 6.}, {5, 10, 10, 7.}} B = {{6, 10, 10, 5.}, {7, 10, 10, 6.}, {8, 10, 10, 7.}} how can i get a matrix which ...
• 313
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### How to use Strings and Functions With Conditions

Very new to Mathematica so this might be really simple. I have the function pow[x_,r_]:= x^r where r is rational due to ...
1 vote
53 views

### How to define a symbollic matrix with variables and numbers

Newbie here. I want to define a (user-defined)function to return symmetric matrices, as I need to define quite a few tensors. I am able to do this using strings. But I need the matrix entries to be ...
238 views

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### Obtaining all possible ways to concatenate matrices

With Prepend we can add a line to all matrices in a set, like this: ...
• 568
1 vote
74 views

### Building other matrices from these ones

First of all, I want to know if it is possible to make a constraint in a set of matrices that I have to obtain a subset. For example, if I have a set of square matrices ...
• 568
820 views

### How to concatenate functions and strings

I have f[x_]=Log[1+x] g[x_]=TraditionalForm[Series[f[x], {x, 0, 4}]] Is there a way to get the answer to print out as ...
427 views

### List of the combinations of more lists via permutations

I would like to generate a list of all the possible combinations of two lists. As for instance, given L=3; list={0,1,2}; I would like to obtain the list {{0,...
• 513
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### Merge neighbour Lists in List

I think the following problem is a good exercise. In a List of Lists, merge lists which define neighbour intervals: for example, ...
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### how to concatenate a list of a list of strings

I have two lists of lists, La and Lb that I want to concatenate so that every element of a list n in La is concatenated with the ...
• 173
1k views

### Simple way to concatenate Dataset columns

Consider these two datasets: d1 = Transpose@Dataset[<|"a" -> Range[5]|>]; d2 = Transpose@Dataset[<|"b" -> Range[5, 1, -1]|>]; {d1, d2} What's ...
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### How to switch from array to string?

Considering we have an array: a = {2/3, 4/5, 9/7, 3/7, 1/7, 1/9}; How can I get this to be: "2/3 4/5 9/7 3/7 1/7 1/9" ...
• 1,578
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### Joining Together Strings and variables [closed]

I am trying to join together strings and variables as part of formatting the output of my code. For example how do I print the line "5 trees" where the number 5 is a variable n that could be changing. ...
• 169
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### How to build a matrix from a set of vectors and other matrices using ArrayFlatten

I want to build a 6 by 3 matrix, from the following: one vector is 3 by 1, then a matrix, which is 3 by 2. These will go to the top 3 rows. Now the bottom 3 rows, I'll have 3 vectors each is 3 by 1. ...
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766 views

### Concatenating strings, unevaluated expressions and evaluated expressions/values

Maybe this is something very simple to some of you. Anyway, I think this can be useful to many others like me. I would like to build an output that involves strings, unevaluated expressions and ...
• 1,081
1k views

### How to name a variable with the value of another variable?

A simple but very important (at least for me) question. In some languages for defining a variable, for example, we can do: i=10 "d"&i=30 So I have defined the variable d10, and... d10=30 ...
136 views

### How to joint symbolic expressions together [duplicate]

I want to joint symbolic expressions together to create a another symbolic expressions. one way to do that is as follows: ...
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331 views

### How to 'merge' a list like FromDigits, but with a mixture of numbers and symbols?

How do I go from {C,4,G,5,S,7} to C4G5S7
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4k views

### Getting a String from a list of strings

Is there a way to write down Mathematica with a string such as: {"M","a","t","h","e","m","a","t","i","c","a"}?
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