I have text file which includes a matrix. I want to read it in julia as a matrix.
The text file is like:
0 0 0 0 0 0 0
1 0 0 0 0 0 0
1 0 0 0 0 0 1
1 0 0 0 1 1 0
In matlab you can do the following to create matrix M :
file='name.txt';
[M] = load(file);
How to do same thing in Julia?
shell> cat /tmp/m.txt
0 0 0 0 0 0 0
1 0 0 0 0 0 0
1 0 0 0 0 0 1
1 0 0 0 1 1 0
julia> m = readdlm("/tmp/m.txt")
4x7 Array{Float64,2}:
0.0 0.0 0.0 0.0 0.0 0.0 0.0
1.0 0.0 0.0 0.0 0.0 0.0 0.0
1.0 0.0 0.0 0.0 0.0 0.0 1.0
1.0 0.0 0.0 0.0 1.0 1.0 0.0
Related
I'm trying to find the 4-neighbors of all 1's in a matrix of 0's and 1's using the J programming language. I have a method worked out, but am trying to find a method that is more compact.
To illustrate, let's say I have the matrix M—
] M=. 4 4$0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0
0 0 1 0
0 0 0 0
0 0 0 0
and I want to generate—
0 0 1 0
0 1 0 1
0 0 1 0
0 0 0 0
I've sorted something close (which I owe to this little gem: https://www.reddit.com/r/cellular_automata/comments/9kw21u/i_made_a_34byte_implementation_of_conways_game_of/)—
] +/+/(|:i:1*(2 2)$1 0 0 1)&|.M
0 0 1 0
0 1 2 1
0 0 1 0
0 0 0 0
which is fine because I'll be weighting the initial 1's anyway (and the actual numbers aren't really that important for my application anyway). But I feel like this could be more compact and I've just hit a wall. And the compactness of the expression actually is important to my application.
Building on #Eelvex comment solution, if you are willing to make the verb dyadic it becomes pretty simple. The left argument can be the rotation matrix and then the result is composed with +./ which is a logical or and can be weighted however you want.
] M0=. 4 4$0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0
0 0 1 0
0 0 0 0
0 0 0 0
] m =.2,\5$0,i:1
0 _1
_1 0
0 1
1 0
m +./#:|. M0
0 0 1 0
0 1 0 1
0 0 1 0
0 0 0 0
There is still an issue with the edges (which wrap) around, but that also occurs with your original solution, so I am hoping that you are not concerned with that.
] M1=. 4 4$1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
m +./#:|. M1
0 1 0 1
1 0 0 0
0 0 0 0
1 0 0 0
If you did want to clean that up, you can use the slightly longer m +./#:(|.!.0), which fills the rotation with 0's.
] M2=. 4 4$ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 1
m +./#:(|.!.0) M2
0 0 0 0
0 0 0 0
0 0 0 1
0 0 1 0
m +./#:(|.!.0) M1
0 1 0 0
1 0 0 0
0 0 0 0
0 0 0 0
I have an column vector with following format in R: num [1:2464, 1].
I want to diagonal the vector, so each element is in the diagonal of the matrix. I have tried the following code:
diagvector <- diag(myvector)
But then it just show the first number. I think I only can use that code if my vector have the following form: num [1:2464].
So how do I a) change the format from num [1:2464, 1] to num [1:2464] for my vector, or b) take the diagonal to my vector with the format num [1:2464, 1]?
Your "column vector" is actually a matrix as it has two dimensions, but it can be formed into a vector.
myvector <- matrix(1:2464, 1)
diagvector <- diag(c(myvector))
diagvector
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] ...
[1,] 1 0 0 0 0 0 0 0 0 0 0 0 0
[2,] 0 2 0 0 0 0 0 0 0 0 0 0 0
[3,] 0 0 3 0 0 0 0 0 0 0 0 0 0
[4,] 0 0 0 4 0 0 0 0 0 0 0 0 0
[5,] 0 0 0 0 5 0 0 0 0 0 0 0 0
[6,] 0 0 0 0 0 6 0 0 0 0 0 0 0
[7,] 0 0 0 0 0 0 7 0 0 0 0 0 0
[8,] 0 0 0 0 0 0 0 8 0 0 0 0 0
[9,] 0 0 0 0 0 0 0 0 9 0 0 0 0
[10,] 0 0 0 0 0 0 0 0 0 10 0 0 0
[11,] 0 0 0 0 0 0 0 0 0 0 11 0 0
[12,] 0 0 0 0 0 0 0 0 0 0 0 12 0
[13,] 0 0 0 0 0 0 0 0 0 0 0 0 13
...
Or:
myvector <- matrix(1:2464, 1)
diagvector <- diag(length(myvector)) * c(myvector)
diagvector
I have a datafile contains two 101*101 matrix of float numbers, one is data and the other is error.
It looks like this
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
10381.8 0 0 3462.03 10341 0 6889.64
6919.26 6916.64 3459.49 10349.8 13781.3 6887.57 24157.2
3459.66 0 24158.9 13792.6 3433.65 27579.4 24117.4
0 0 0 0 0 0 0
0 0 0 0 0 0 0
# Errors [Positon_sample/samp_psd.txt] I_err:
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
4892.66 4890.8 3459.49 5975.49 6890.64 4870.25 9130.63
3459.66 0 9131.25 6896.32 3433.65 9750.84 9115.54
3464.99 4888.97 5972.77 11419.1 7713.44 8438.29 9093.38
0 0 0 0 0 0 0
0 0 0 0 0 0 0
Now I would like to only plot the first matrix.
I use "plot 'E:\samp_psd.txt' matrix with image"
But the program corrupt...
It seems that I should set the dimension of the matrix,
My case is a little similar like this
Gnuplot plot Matrix over Matrix
I would separate the two matrices with two empty lines like this:
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
10381.8 0 0 3462.03 10341 0 6889.64
6919.26 6916.64 3459.49 10349.8 13781.3 6887.57 24157.2
3459.66 0 24158.9 13792.6 3433.65 27579.4 24117.4
0 0 0 0 0 0 0
0 0 0 0 0 0 0
# Errors [Positon_sample/samp_psd.txt] I_err:
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
4892.66 4890.8 3459.49 5975.49 6890.64 4870.25 9130.63
3459.66 0 9131.25 6896.32 3433.65 9750.84 9115.54
3464.99 4888.97 5972.77 11419.1 7713.44 8438.29 9093.38
0 0 0 0 0 0 0
0 0 0 0 0 0 0
Then you can access a single matrix with the index command like this:
plot "samp_psd.txt" index 0 matrix with image
Given this file:
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How would one use awk to make this calculation of Queries per second (Queries/Uptime):
1146/2389
And print the result?
I'm grepping 2 results from a list of results and need to calculate items/second where 302 is the total item count and 503 the total uptimecount.
At this moment I'm doing
grep -Ew "Queries|Uptime" | awk '{print $2}'
to print out:
302
503
But here i got stuck.
You can use something like:
$ awk '/Queries/ {q=$2} /Uptime/ {print q/$2}' file
0.600398
That is: when the line contains the string "Queries", store its value. When it contains "Uptime", print the result of dividing its value by the one stored in queries.
This assumes the string "Queries" appearing before the string "Uptime".
Given your updated input, I see that we need to check if the first field is exactly "Uptime" or "Queries" so that it does not match other lines with this content:
$ awk '$1 == "Queries" {q=$2} $1=="Uptime" {print q/$2}' file
0.479699
I think the following awk one-liner will help you:
kent$ cat f
Queries 302
Uptime 503
LsyHP 13:42:57 /tmp/test
kent$ awk '{a[NR]=$NF}END{printf "%.2f\n",a[NR-1]/a[NR]}' f
0.60
If you want to do together with "grep" function:
kent$ awk '/Queries/{a=$NF}/Uptime/{b=$NF}END{printf "%.2f\n",a/b}' f
0.60
As we know, GLCM (Grey Level Co-occurrence Matrix) describes the texture characteristics of images. But in usual, the calculation of GLCM in OpenCV, matlab often aim on a picture. But now I just want to get GLCM value of every single point inside the image, but how to get it?
If I understand your problem correctly, then perhaps you can just set the pixels outside your region of interest to NaN - these pixels are ignored by MATLAB when calculating the GLCM.
For example:
>> im = eye(7)
im =
1 0 0 0 0 0 0
0 1 0 0 0 0 0
0 0 1 0 0 0 0
0 0 0 1 0 0 0
0 0 0 0 1 0 0
0 0 0 0 0 1 0
0 0 0 0 0 0 1
>> graycomatrix(im)
ans =
30 0 0 0 0 0 0 6
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
6 0 0 0 0 0 0 0
>> im([1:10,13:16,21:24,28:29,34:37,41:49]) = NaN % Remove pixels outside ROI
im =
NaN NaN NaN NaN NaN NaN NaN
NaN NaN NaN NaN 0 NaN NaN
NaN NaN 1 NaN 0 0 NaN
NaN 0 0 1 0 0 NaN
NaN 0 0 0 1 0 NaN
NaN NaN 0 0 NaN NaN NaN
NaN NaN NaN NaN NaN NaN NaN
>> warning('off', 'Images:graycomatrix:scaledImageContainsNan')
>> graycomatrix(im)
ans =
6 0 0 0 0 0 0 2
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
2 0 0 0 0 0 0 0
>> warning('on', 'Images:graycomatrix:scaledImageContainsNan')
Does that do what you need?