АО
Size: a a a
2020 December 09
АО
То есть вводите аргументы, а вам показывают, какие функции могут их использовать.
A
You can use https://github.com/ahwillia/Einsum.jl package
using Einsum
using LinearAlgebra
x = rand(3, 3)
δ = I(3)
A = ones(3, 3) # preallocated space
@einsum A[i, k] := x[i, j] * δ[j, k]
thank you so much🙏🙏
A
if I have example like this:
for x =-1:1, y=-1:1, k in 1, j in 0
if x==1 && y==1
println("1+$k-$j")
elseif x==1 && y==-1
println("1-$k+$j")
end
end
Now this works, but I wanna use the result of println in the function like this:
fun = 3* (?)
instead of (?)
How I can put the above condition. It should be work during "for loops"
for x =-1:1, y=-1:1, k in 1, j in 0
if x==1 && y==1
println("1+$k-$j")
elseif x==1 && y==-1
println("1-$k+$j")
end
end
Now this works, but I wanna use the result of println in the function like this:
fun = 3* (?)
instead of (?)
How I can put the above condition. It should be work during "for loops"
АО
This can't work.
$x is undefined in this contextАО
It's hard to understand, what you really need. What is
fun and what is 3*(?)?A
This can't work.
$x is undefined in this contextCorrected now
АО
Dollar sign has no meaning. Why it appeared at all?
A
It's hard to understand, what you really need. What is
fun and what is 3*(?)?I need to put these conditions in the function
A
Dollar sign has no meaning. Why it appeared at all?
$ can replace with the value of the arguments
АО
No, it cannot. Maybe you are talking about string interpolation? Than it should look like
println("1 + $x - $y"). Note double quotes.A
No, it cannot. Maybe you are talking about string interpolation? Than it should look like
println("1 + $x - $y"). Note double quotes.yeah you right. I wrote like this in julia
A
but the question is how I can put these conditions in the function to work
АО
What conditions? I mean
3*(?) can't be calculated and do not give boolean answer.
i == 1 is a condition. It has a form of equality, which can be calculated and as a result have some boolean answer.3*(?) can't be calculated and do not give boolean answer.
AM
ABC could you describe the following:
1) what is the input for your function
2) what does the function suppose to do
3) what is the output
Otherwise it is difficult to help you
1) what is the input for your function
2) what does the function suppose to do
3) what is the output
Otherwise it is difficult to help you
A
example:
function f(x,y)
for x =-1:1, y=-1:1, k in 1, j in 0
if x==1 && y==1
println("1+$k-$j")
elseif x==1 && y==-1
println("1-$k+$j")
end
end
end
How I can put "f(x,y)" into " fun2 = sum(3*fun(x,y))
I should calculate "fun2"
it has error now
function f(x,y)
for x =-1:1, y=-1:1, k in 1, j in 0
if x==1 && y==1
println("1+$k-$j")
elseif x==1 && y==-1
println("1-$k+$j")
end
end
end
How I can put "f(x,y)" into " fun2 = sum(3*fun(x,y))
I should calculate "fun2"
it has error now
AM
Your function f returns nothing. What do you want to calculate in fun2?
AM
Also you redefined x and y in the loop
AM
J and K are also obsolete there as it is a constant
A
Your function f returns nothing. What do you want to calculate in fun2?
How should I write this code. I want to calculate fun2, but I dont know how I can write f(x,y) with these condition