freedom | hexagonal architecture-based framework | Microservice library
kandi X-RAY | freedom Summary
kandi X-RAY | freedom Summary
Freedom is a hexagonal architecture-based framework that underpins the hyperemic domain model paradigm.
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Trending Discussions on freedom
QUESTION
I am making this program that deals with a lot of colors and it gives the user the freedom to change many of them. In one part of my program I use markup for one of my labels and and I realized something about the 'color' tag.
When my program starts I want my label to follow the theme but I get this warning when trying to set the color to the theme and it does not show the color correctly:
...ANSWER
Answered 2021-Jun-12 at 16:17I think u could try this I think u forget use F-string and get the wrong value
QUESTION
I have a predictor variable called "Group", this group has 3 categories (ALTO, MEDIO, BAJO). In my glm for binomial family, the summary shows the intercept + BAJO and MEDIO, but I need to see in my tab_model only ALTO and MEDIO and let BAJO as intercept. Is there any way to change this setting?
...ANSWER
Answered 2021-Jun-09 at 12:29You can use the relevel()
function to specify which level of the factor is the reference level. Assuming the variable Grupo is already a factor, this should work:
QUESTION
I am reading Joe Duffy's Concurrent Programming on Windows. At the end of the chapter "Memory Models and Lock Freedom", he gives an example of the lock free stack. I have gone through the code and there's one thing I don't understand, that is the need for m_next
field to be marked as volatile
. Because there is a full memory barrier with Interlocked.CompareExchange
right? Does anyone have an idea?
I have pasted the sample code below.
...ANSWER
Answered 2021-Jun-05 at 20:00I'll give my two cents, without being 100% sure that what I am about to say is correct. Joe Duffy is a world-class expert in multithreading, but I think that in this implementation he has been overly cautious regarding the cross-thread visibility of the internal state of the LockFreeStack
class. The volatility of the Node.m_next
field is redundant in my opinion. The Node
instances are mutable, but they are only mutated before they are linked in the internal linked list. After that phase they are practically immutable. That mutable phase is performed by a single thread, so there is no chance that another thread may see a stale version of a Node
instance.
That leaves only the possibility of instructions re-ordering, as a reason for declaring the Node.m_next
as volatile
. Since the n.m_next = h;
assignement is sandwiched between reading another volatile field (m_head
), and an Interlocked.CompareExchange
operation, I would assume that a possible re-ordering of the instructions that would compromise the correctness of the implementation is already prevented, but as I said I am not 100% sure.
I am pretty sure though that the implementation of the LockFreeStack
class could be improved performance-wise, at the cost of becoming slightly more allocatey, by making immutable the Node
class. Nowadays (C# 9) this can be achieved simply by switching from type class
to type record
. This is how such an implementation would look like:
QUESTION
I have a text like this:
...ANSWER
Answered 2021-May-24 at 18:10You can add it into set so that there wont be any duplicates and remove comma if not required :
QUESTION
I have problem because my elements are not well align vertically downward the test after the "-" starts haphazardly.
I have tried enclosing the time tag with div
elements and align them so that all the time
elements take-up equal space but this does not work it instead separates the
ANSWER
Answered 2021-Jun-03 at 14:37You can add width to .dates itself and change its display
property because width
won't wrok for inline elements. I moved the character '-' outside so it looks nicer. You can also wrap this in
and give some margin to make space so it looks even more nicer.
QUESTION
I have been trying to get a linearized version of a MultiBodyPlant without gravity to experiment with LQR for systems without gravity. However, the linearization leads to some interesting phenomena. A simplified example can be found in this google colab notebook.
When I linearize and check the rank of the controllability matrix for a single free-floating rigid body, I get a rank of 6. This is expected as I use the get_applied_generalized_force_input_port()
as the input port, hence making sure that all possible forces can be applied to the system. The system of a single rigid body has 6 degrees of freedom (DoF) and the rank of the controllability matrix is 6, hence it is controllable.
However, when I use Drake's in-built function IsControllable()
to check the controllability, it results False
meaning that it thinks the system is not controllable. In the source of the IsControllable()
function, the rank of the matrix is checked against the number of rows in the A
matrix. I think that this might be causing an issue as the linearization involves the use of quaternions during the AutoDiff (thus adding one more row to the A
matrix due to 4 numbers being used for quaternions to represent the state). The linearization process does not know about the unit-quaternion constraint, and hence the A
matrix for a system using quaternions will have 1 more row than the DoF of the system.
I wonder if this is the correct intuition for the controllability mismatch?
And could this cause issues as other functions within Drake that maybe use the IsControllable()
function for verifying controllability?
ANSWER
Answered 2021-May-30 at 00:38I think IsControllable()
is doing the right thing. If you have a single body with a floating base, then you have 13 state variables (7 positions, 6 velocities). If you were to simply linearize the equations, then you are right that the resulting linear system would not know about the unit quaternion constraint. Asking for controllability of this system would be asking you to drive the system to the origin (quaternion => 0 ~= unit quaternion). Since your dynamics model cannot achieve that, even in the linearization, I expect your system is not controllable in that linearization.
You could replace the quaternion floating base with a roll-pitch-yaw floating base. We have some API that will make that easier coming in https://github.com/RobotLocomotion/drake/issues/14949 . But in the mean time, you can add the three translations and a BallRpyJoint.
The alternative to look into the literature on control in SE(3) directly using quaternions. There are elegant results there, but linear analysis won’t help.
QUESTION
We have been using APIM since 2018. As the legacy portal has been deprecated and we wanted more freedom, we decided to skip the default APIM portal altogether, and to embed the APIM API methods in our own website, using Postman as the documentation portal.
Most of the methods are straightforward, but it's not clear how to sign-in the user? We can, of course, fetch their statistics and API keys, but how do we know they are who they claim they are?
The code in the self-hosted portal in GitHub is more client-side oriented.
EDIT. From the usersService.ts module it appears that GET /identity with the Authorization
header made of Basic
and base64-encoded pair of userId:password is to be invoked.
But I keep getting:
...ANSWER
Answered 2021-May-28 at 11:33OK, solved (with the help of Microsoft support who sent a screenshot of the method being invoked on their side).
It seems that the method is not to be invoked from management.azure.com
like all the other methods. Nope. It has to be invoked from the Management API URL that can be found in the Management API section of your APIM in Azure.
Curiously, the management API toggle does not even have to be on.
Your GET request should be like this:
https://my_apim_instance.management.azure-api.net/subscriptions/my_subscription_id/resourceGroups/my_resource_group/providers/Microsoft.ApiManagement/service/my_apim_instance/identity?api-version=2019-12-01
Now cue in the ever-helpful posters with ever-useful post-solution advice.
QUESTION
I want to provide both the data and variable names in a function. This is because users might provide datasets with different names of the same variables. Following is a reproducible example that throws an error. Please refer me to the relevant resources to fix this problem.
Also, please let me know what are best practices for writing such functions? In the documentation, should I ask a user to rename their columns or provide a dataset with only the required columns?
Example ...ANSWER
Answered 2021-May-28 at 08:28This seems like a very unusual way to write an R function, but you could do
QUESTION
I am doing an exercise from a textbook and I have been stuck for 3 days finally I decided to get help here.
The question is: write a program that reads the contents of a text file. The program should create a dictionary in which the key-value pairs are described as follows:
- Key. The keys are the individual words found in the file.
- Values. Each value is a list that contains the line numbers in the file where the word (the key) is found.
For example: suppose the word “robot” is found in lines 7, 18, 94, and 138. The dictionary would contain an element in which the key was the string “robot”, and the value was a list containing the numbers 7, 18, 94, and 138.
Once the dictionary is built, the program should create another text file, known as a word index, listing the contents of the dictionary. The word index file should contain an alphabetical listing of the words that are stored as keys in the dictionary, along with the line numbers where the words appear in the original file.
Figure 9-1 shows an example of an original text file (Kennedy.txt) and its index file (index.txt).
Here are the code i tried so far and the functions is not completed, not sure what to do next:
...ANSWER
Answered 2021-Jan-02 at 04:13You are on the right track. This is how it can be done
QUESTION
I am doing some exercises using package r-exams, in which I print a summary from an lm
object and ask students things like, “which is the estimated value of the intercept”. The idea is that the student copies the values of the summary output and use that value as the correct answer. The issue here is that I use the values from coef()
function as the correct answers, but this is not a good idea since the precision of these values are quite different from the precision of the values shown in the summary
output. Here is an example:
ANSWER
Answered 2021-May-26 at 15:21Some useful information for such questions in R/exams:
The
extol
can also be a vector so that you can set different tolerances for coefficients and R-squared etc.When asking about the R-squared, though, I typically ask for it "in percent". Then the same tolerance may be suitable as for the coefficients.
I would recommend to control the size of the coefficients suitably so that
digits
andextol
can be set accordingly.Personally, I typically store the
exsolution
at a higher precision than I request from the students. For example,exsolution
could be12.345678
while I only setextol
to0.01
. This makes sure that when the correct answer is rounded to two decimal places it is inside the correct interval determined byexsolution
andextol
.
Details on formatting of the coefficients in the summary:
It is not obvious where exactly the formatting happens: The
summary()
method forlm
objects returns an object of classsummary.lm
which has its ownprint()
method which in turn callsprintCoefmat()
. The latter is the function that does the actual formatting.When setting the
digits
in these functions, this controls the number of significant digits and not the number of decimal places. This is particularly important when the coefficients become relatively large (say, in the thousands or more).The coefficients are not formatted individually but jointly with the corresponding standard errors. The details depend on the
digits
, the size of both coefficients and standard errors, and whether any coefficients are aliased or exactly zero etc.Without aliased/zero coefficients the formatting from
summary(m0)
can be replicated usingformat_coef(m0)
as defined below. That's essentially the boiled-down code fromprintCoefmat()
.
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