modeling

问题 I'm in the process of getting my head around UML state digrams while analysing the states that one of our customers can have. I'm attempting to use a composite state with orthogonal regions in which one state in one reason is the trigger for at least one state change in another orthogonal reason. I realise that I might be trying to use the wrong paradigm to model this, so feel free to correct me on that basis, but there is a simplified but slightly more detailed explanation of the situation

问题 As already asked in http://www.eclipse.org/forums/index.php/t/452409/ I am not sure I correctly got the meaning of local transition and I'd like to know whether I am using them with the right semantics or not Are these two state machines equal? 回答1: Under UML 2.4.1, the first diagram shows a local transition from State1 on receipt of trigger where the second shows transitions between sub-states on receipt of trigger . An external transition from State1 would be shown by the arrow pointing out

问题 *Note - I have read several of the posts on how to find starting values for NLS - however, I have not found one with an equation of this form (i.e. 4 parameters, exponent raised to a power) I am struggling tremendously to find suitable starting values for the Chapman Richards equation, which is commonly used in forestry to model tree growth. y(t) = α * (1 - β * exp(-k * t)^{1/(1-m)}) I typically try to find initial values by plotting a line with set parameters, and then tweaking it to fit the

问题 I'm creating a plug-in which adds various functions on top of a core application. The plug-in gives administrators the ability to upload a CSV file and performs the following functions depending on the information entered in the file (by performing operations on the database of the core application): Creating users Can be administrators or normal users Creating projects Can be parent projects or sub-projects of a parent project Sub-projects get copied from a given parent project (so the

问题 I'm creating a plug-in which adds various functions on top of a core application. The plug-in gives administrators the ability to upload a CSV file and performs the following functions depending on the information entered in the file (by performing operations on the database of the core application): Creating users Can be administrators or normal users Creating projects Can be parent projects or sub-projects of a parent project Sub-projects get copied from a given parent project (so the

问题 I would like to ask what is the difference between a subsystem and a component in the UML sense? 回答1: I have to agree with Preet, but practically, a subsystem is larger than a component. I use components for libraries (either bought, pillaged, or built) and subsystems for a part of the whole system that performs a given integrated function. For example, in a blood processing device, the centrifuge driver and control would be a component. The integrated blood suction regulation (which includes

问题 Given a slice plane in the world, I want triangles to be seen if they were on the positive side of the plane, and those who intersect with the plane are split and the part on positive plane can be seen too. If I slice the triangles meshes every time when plane is changed, it may be very slow when there are tons of triangles, and texture coordinate will be re-generated too. If I set the camera(view) and projection carefully, it may generate similar result, but this result is view dependent. So

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 6 years ago . I'm looking to mode the solar system within c++ and openGL, and I was wondering if there was a cheap method that I could produce that would return an x,y,z vector that I could use to update the position of each

问题 I was hoping you could tell me what the advantages and disadvantages of BPMN are in a developers perspective. I'm comparing UML with BPMN and a found a bunch of advantages and disadvanteges for UML but none for BPMN. 回答1: It's largely down to audience and purpose. In terms of modelling language, BPMN and UML activity diagrams cover pretty much the same conceptual space with different notations. The notation thing gets religious very quickly. I personally prefer AD notation over BPMN - but it

问题 I am trying to fit a dynamic mixture model (Weibull for the bulk, Pareto for the tail) using the fdwm() function from the evmix package: library(repmis) library(evmix) data=source_data("https://www.dropbox.com/s/r7i0ctl1czy481d/test.csv?dl=0")[,1] test=fdwm(data,c(0.9150062,75.4699181,quantile(data,0.98),11.21,87.41,0.05)) I am experiencing a weird behavior: the function first returns an error...: Error in integrate(rx, wshape, wscale, cmu = cmu, ctau = ctau, sigmau = sigmau, : non-finite