WebInitial value problem. In multivariable calculus, an initial value problem [a] ( IVP) is an ordinary differential equation together with an initial condition which specifies the value of the unknown function at a given point in the domain. Modeling a system in physics or other sciences frequently amounts to solving an initial value problem. WebAn ordinary differential equation ( ODE) is an equation containing an unknown function of one real or complex variable x, its derivatives, and some given functions of x. The unknown function is generally represented by a variable (often denoted y ), which, therefore, depends on x. Thus x is often called the independent variable of the equation.
How can we fix the error "unknown egen function group ()" with …
WebMay 28, 2024 · Code: by patientid (timeslots), sort: egen MEAN1 = mean (blood pressure value) will work, except that "blood pressure value" is not a valid Stata expression due to … WebNov 29, 2024 · Modified 3 years, 4 months ago. Viewed 409 times. 1. I'm working with unknown functions, for example I have. f = g [Subscript [x,1],Subscript [x,2],Subscript [x,3]] … red balloon saint paul
How to solve for unknown function in integral equation?
WebSep 21, 2024 · Here the initial 0 is not needed in your code, but it does help in mine. It is crucial in this code not to use the = sign in defining the macro. An equivalent would be to define the expression. Code: gen b = 0 forval j = 0/3 { replace b = b + ( ( (mean_dr`j'-mean_dr) * (mean_or`j'-mean_or))/var_or) + (r_ordr`j'* (var_or`j'/var_or)) } replace b ... WebJun 28, 2024 · Moreover, it does not work even if I try to generate simple variables like mean by (). Stata's output: . egen mdLiab=mean (dLiab), by (company) unknown egen function … WebJan 19, 2024 · 0. One idea can lie in the use of a family of functions the decompose the unknown f. Choose an orthogonal family over the chosen domain, so 0 to infinity in this case. That may mean Bessel functions. It may mean something like Laguerre polynomials. That is, we can write the integral in a form like. intt (K*f*dt) = int (K*exp (-t)*exp (t)*sum (a ... kmc cleaners \u0026 restoring services