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VHDL macro for vector indices


VHDL macro for vector indices

By : user2953681
Date : November 21 2020, 01:01 AM
hop of those help? I am searching for a macro, constant or attribute, whatever it is, replaces "(x downto y)". To explain in detail for example complex numbers, , A subtype can be used to declare an integer range like:
code :
-- **pseudo** re = 2*WIDTH-1 downto WIDTH; im = WIDTH-1 downto 0; **pseudo**
subtype re is natural range 2*WIDTH-1 downto WIDTH;
subtype im is natural range   WIDTH-1 downto 0;
x <= num(re);
y <= num(im);


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Treating a vector as a function on its indices/applying this function to another vector (of indices)

Treating a vector as a function on its indices/applying this function to another vector (of indices)


By : Ankur Mishra
Date : March 29 2020, 07:55 AM
With these it helps Let y=[4;6;2;9;5;1] be a column vector and let i=[4,2,1] be a vector of indices. I would like to somehow "apply" i to y and obtain [9,6,4]. Or at least [4;2;0;9;0;0]. , Simple:
code :
y(i)
out = zeros(size(y));
out(i) = y(i);
How to pick indices that are not in my indices vector MATLAB

How to pick indices that are not in my indices vector MATLAB


By : Juerg Amrein
Date : March 29 2020, 07:55 AM
around this issue Consider A an m by n matrix. I want to split A column wise by randomly picking NumOfRandomColumn columns. I have used this code to generate a vector of random indexes and extract the firs section: , This should work:
code :
notselected = 1:MatrixColumnNumber;
notselected(indexes) = [];
secondSection = A(:,notselected);
Remove rows from data frame using row indices where row indices might be zero length vector

Remove rows from data frame using row indices where row indices might be zero length vector


By : Pedro Vasquez
Date : March 29 2020, 07:55 AM
it fixes the issue I want to drop some rows from some dataframe using numeric indices of the rows. But sometimes the indices vector that I am going to drop becomes zero length vector. In this case, I expect that nothing should be dropped from the original data frame. But instead of nothing everything is dropped. , For this reason, it is better to use %in% and negate ! it
code :
df[!seq_len(nrow(df)) %in% drop, ]
df %>%
   filter(!row_number() %in% drop)
How to replace some indices of a vector with the same indices of another vector in R?

How to replace some indices of a vector with the same indices of another vector in R?


By : VonCrisp
Date : March 29 2020, 07:55 AM
should help you out I have two vectors (in R), each with the same length. I want to replace all negative values in vector A with the corresponding indices in vector B. For example, if indices 5, 7, and 9 of vector A are negative values, I want to replace indices 5, 7 and 9 of vector A with indices 5, 7, and 9 in vector B. , Here is one quick way:
Can I access 2 indices of an array at the same time VHDL

Can I access 2 indices of an array at the same time VHDL


By : Arden2600
Date : March 29 2020, 07:55 AM
This might help you Yes that is perfectly fine.
In you example, it's "just wires" so it is as efficient as any other (correct) syntax.
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