# Tagged Questions

The tag has no wiki summary.

49 views

### For loop with MapIndexed and If [on hold]

I have a for loop that uses MapIndexed and If to build a a list called avald1. The problem ...
141 views

### How to Map each cell in a matrix to another and solve the system?

tab1 = {{a1, a1 + a2}, {b1, b2*b2}} tab2 = {{2, 5}, {5, 2}} I want to map like this ...
104 views

### Planning for the Tube Challenge using Mathematica

The Tube Challenge is a task in which participants have to visit all the stations of the London Underground railway system in the shortest possible time. Let's modify it so that participants are ...
49 views

### How can Map be given access to the keys of a Dataset?

Consider an example Dataset: ...
18 views

### MapThread with incompatible length (How to Map twice in the same line)

l and b are two lists of vectors with different length. I need the list of vectors that is constructed by adding each member of ...
234 views

### Mathematica periodic moving map

I am pleased to have MovingMap in Mathematica 10. But, today, I encountered the problem that needs MovingMap with a periodic boundary condition. To be specific, Consider the following example. ...
112 views

### Excluding cases from Map

I'm doing operations of the form: PowerMod[#, -1, 126]+# & /@ Range[1, 125] When a number is not invertible, I don't want it to be included in the result ...
61 views

### How to manipulate one column of a table using the value in another column

Let's imagine I have the following table structure data = {{a, b}, {c, d}, {e, f}}; and I want to transform it into the following table ...
41 views

### Mapping also for one element (or telling it how to do so if head got changed)

Some code generates a polynomial, and has the form: expr = Plus[a[i],b[i],c[i],d[i]] I need to apply f to each term. To do ...
58 views

Suppose that I have f[a_, b_, x_] := ... I'd like to create a list of n pure functions ...
307 views

### Operate over list of pure functions

I have list of pure functions (All functions are InterpolatingFunction) i.e {{a, b}, {c, d}, {e, f}, ...} and I would like ...
111 views

### MapAt a function at specific positions

I'm trying to solve for $p3$ in 3p3-5 = p1 + p2 at positions where p1*p2 == 0: ...
74 views

### Elementwise operation, part deux [closed]

There are many answers to this question: which are forms of Mathematica's map, but languages like Scheme (I think also Python in recent years) also provide a ...
118 views

### Mapping over an association producing an unexpected result

The documentation for associations says that the keys of an association are transparent for many operations. Map is one such operation. However, I am confronted ...
169 views

### Mapping a function over the parts of a deeply nested Array

I have two tensors: tensorS = Array[Subscript[s, #1, #2, #3, #4] &, {2, 16, 16, 19}]; tensorR = Array[Subscript[r, #1, #2, #3] &, {2, 16, 19}]; ...
113 views

### Is there a built-in function to map a list of heads to a list of data?

Assume that this built-in function is called func. What I want is func[{f,g},{a,b,c}] will return the following result: ...
339 views

### Make MapIndexed listable

My goal is to apply MapIndexed to every element of a nested list without destroying the arithmetic operations within the elements. For example, let's start with ...
112 views

### Plot range of a 2-dimensional function as a function depending on one variable

I want to plot a function of 2 variables x and y, for discrete values of y, like: ...
67 views

### Map Elements of a list to be Index of matrix

I have a sublist from Tuples[{1, 2, 3}, 2], say for example L={{1,2},{2,1},{2,2}}, and a 3 x 3 matrix ...
264 views

### Apply function to every element of list regardless of depth

I want to apply a function to every element of a list without taking braces into account (depth level), but with the same form of output. Here is an example : ...
80 views

### ParallelMap returns incorrect results over Map

I've written a function to pull in the useful column of a large data file: ...
414 views

### Changing Values in an Association using Map

I am trying to change the value of one key in an association based on the value of another key in that association. So if my association starts as: ...
122 views

### Map 2 list to a function

Im playing around with CountryData and I want to pass it 2 lists as argument, listCountries = {...} and ...
492 views

### Why is there a huge performance gap using Map with more than 100 List entries

im using Map on a List like this: cube= {{1, 1, 1}, {1, 1, 2}, {1, 1, 3}, {1, 1, 4}, ... , {5, 5, 4}, {5, 5, 5}} Mapping the whole List with 125 entries takes ...
87 views

### Can I use Map here rather than Table?

I've got something that works, but it seems like it would be "nicer" if I didn't have to use Table (or For, etc.). I've got 3 Excel files, each with multiple sheets. Each file also has a sheet ...
201 views

### Unexpected result from Map [closed]

I'm using Mathematica 8.0. Is the following output a bug or do I miss something? f[a_] = 2 a; Map[f,1+x] gives $2+2x$ as expected, but ...
145 views

### Correct slot assignment when mapping from different lists using pure function

Given expr = u == a1 + a2 x + a3 y; and uRep = {u1, u2, u3}; xyRep = {{x1, y1}, {x2, y2}, {x3, y3}}; I'd like to generate ...
42 views

### Testing a certain function over multiple levels

I regularly want to test if a certain function, here foo, gives the expected result when mapping it over n - level - matrices. My naive approach is to write: ...
141 views

### Loop in solving multiple matrix calculation

I am wondering is there a way to use loop, like Do, For, to rewrite the last line in the code. I tried to use ...
109 views

### Mapping a function over n levels

I want to map a function over a matrix of rank n, for example: ...
98 views

### How do you add options to a function that is being mapped?

Simple example: Normally: ListPlot[list, Joined->True] If I want to map ListPlot how do I keep the ...
83 views

### MapIndexed stops at levelspec 1 if only the index is passed?

If the function passed to MapIndexed references the first (or data) argument, the following performs as expected: ...
64 views

### alignment of plots [closed]

I want to align my plots like I did with Gird[]. But you cracks here are using these short forms all the time. So, is there a way to achive this result in a better ...
514 views

### Scan vs Map vs Apply

I cannot understand the difference between Apply, Scan, and Map. I have tried to play with ...
110 views

### Country borders and grids with CountryData plot?

I am coloring several countries in the manner of the following: ...
131 views

### Apply Eigenvalues to a list of matrices

I would like to apply Eigenvalues[] to a list of matrices as in the following ...
245 views

### Mapping multiple functions over an array

I am looking for an elegant way to Map multiple functions over an array. My problem looks something like this: Consider a list of functions: ...
30 views

### Using Map with functions that take a parameter [duplicate]

I have a list l={{0, 0, 0, 3}, {0, 0, 0, 3}, {0, 0, 1, 2}} And I would like to obtain the number of zeros in each sublist: ...
347 views

### How to apply a function of several arguments to a list?

I have a list of triplets: list = {{1, 3, 5}, {4, 5, 1}, {4, 9, 2}} How can I apply a function f to the last element of each triplet when f the last and ...
31 views

### Use Map with OptionValue [duplicate]

Trying to map OptionValue to a list of option names doesn't work. ...
55 views

### Function output of two lists are only diagonal elements

I'm having a little crysis over here. What I basically want to do is some sort of 3D-Plot, but I'm only interested in the resulting values. I have two vectors x and p: ...
91 views

### Parallelize[Mapindexed[]], level={-1}? Sal Mangano's 《Cookbook》

It is easy to Parallelize[] Map[] & MapIndexed[], as having been shown in MMA9 Help for ParallelMap[] and Parallelize[]. For MapIndexed[], the default levelspec is {1}. However there are many ...
174 views

### Distinguishing slots in a function mapping Position across a list

Suppose that I have a list myList that has more than one level. Here is an example of such a "data structure": ...
180 views

### MapThread multiple functions onto multiple lists

I'm trying to learn the functional style which seems to prevail in Mathematica. I'm having trouble accomplishing the following: Let's say I have multiple lists of arbitrary data (using two lists ...
57 views

### Mapping a function of two arguments where the 2nd arg has a fixed value

I create three random images: i1 = Image[RandomReal[1, {8, 12, 3}]]; i2 = Image[RandomReal[1, {8, 12, 3}]]; i3 = Image[RandomReal[1, {8, 12, 3}]]; I can scale a ...
104 views

### Want explanation of when different looping constructs are appropriate [duplicate]

For example when would you use a Do loop over a For loop? For which tasks would you use Map, ...
123 views

### MAP a business cycles model

There is a Business Cycles Map on Phaser 3.0 and I've trying to run it on Mathematica the last four days without succes. The equations are  x_1 = (1.0 - a s)x_1 + a \left[s m + g \left(\frac{s ...
129 views

### Can one use Map during Expand?

Can one Map a simplifying function to the summands of an Expand before fully expanding the expression in question first? ...