I'm a newbie, so my mistake is probably super obvious. The figure is created, but the actual lines are not drawn. The program should be able to interpret the input 'cos(x)' and then plot it using eval, but it doesn't seem work. You could do things like having functions with a base name followed by an index as in fn1, fn2, fn3, and then invoke these dynamically using feval ( 'fn', num2str (k), x, y, z). All () of those engaged agree that EVAL should be avoided. at 22:04 Add a comment 3 Answers Sorted by: 19 For feval, the first argument can be a quoted string, giving you more flexibility than a function handle. Evaluate MATLAB commands, create and edit files, view results, acquire data. Plot_handles(window_id) = plot(x_axis, y_x) 1 Link Commented: Sean de Wolski on Here at Matlab Answers we often answer and discuss questions related to dynamic names of variables and EVAL, here short for the functions, eval, evalin and assignin. We can also pass one or more arguments/variables while calling a function. X1 = input('Type starting value (x): ' ) Window_input = input('In which window do you want to plot your function? ', 's') į_x = input('Type a function f(x) : ', 's') the integrand as a rational function and then evaluate the integral. So far I have this: function = createPlot(plot_handles) 94 of Chegg customers say they get better grades when they use Chegg to understand. I have a piece of software where users (other programmers) need to be able to write their own functions to be called at a particular time. It should also return the vector plot_handles (which contains the plot handles for the specified function at the same index/position as the window-id) to mainMenu.m for later use. Accepted Answer: Walter Roberson First of all, I know using eval at all is generally bad practice, but in this case it's kind of necessary. The job of createPlot.m is to ask the user for a window-id as well as a function and then plot the function in that window. It starts by calling the function createPlot.m with plot_handles (empty at first). Note that the strings making up the rows of matrix D must all have the same length.Alright, so I have a m-file called mainMenu.m, which is the main program and it looks something like this: The next example runs a selected M-file script. Generates a sequence of 12 matrices named M1 through M12. Use lasterr to obtain the error string produced by string. FUN is a function handle for the self-written function that describes the. If the operation generates an error, catchstring is evaluated before returning. Answers Trials Produkt-Updates Alternatives to the eval Function Why Avoid the eval Function Although the eval function is very powerful and flexible, it is not always the best solution to a programming problem. MATLAB's integral function, which is discussed next, is able to evaluate some. It executes string and returns if the operation was successful. The steps that I follow to solve this problem are: First, I define the function py and px that is the partial derivate aproximation of f. an array of numbers, or an instance of poly1d, at which to evaluate p. Which hides information from the MATLAB parser and can produce unexpected behavior. If p is of length N, this function returns the value. = eval(' expression')Įvaluates and returns the results in separate variables. Create ' expression ' by concatenating substrings and variables inside square brackets. Returns the value of expression, a MATLAB expression, enclosed in single quotation marks. 1 Link Commented: Walter Roberson on Hello, I've seen a solution on here about how to calculate a derivative function of a function handle here. Interpret strings containing MATLAB expressions Eval (MATLAB Function Reference) MATLAB Function Reference
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