STRUCT IN MATLAB 2012 CODE

I leave it as an exercise for you to show that snippet runs correctly using either ss or ssExtra as inputs.ДЇor extra credit, anyone care to write the code I'd need to add to snippet to disallow inputs with an extra fields to work? I gave a hint earlier in this column.ДЄny thoughts on this topic? If so, enter them here. Snippet expects a struct with fields time and amplitude

'snippet expects a struct with fields time and amplitude') ~(isfield(D,'time') & isfield(D,'amplitude')) % If either D.time or D.amplitude are missing, SNIPPET errors out. % SNIPPET(D) plots data from a struct D which must contain the two fields: I now understand that I have to look at the details of the structure variables to see if the fields I need are there. I've seen this confusion between structures, their fields, and variables, fairly regularly on Grand total is 3969 elements using 31361 bytesДЄnd I see that I have ss but not ss.time because ss.time is a member of the struct but not a variable itself. I can also see what variables I do have in my workspace: whos So now let me check my variable name using the function isvarname. Looking at the help carefully, I see that the name I give must be a variable name or the name of some file Or, the 'julia way' is to define a StructArray type. If the number of fields is small, one could define a type with all the needed field names and use that. If the number of fields is very large, a hash table of symbols makes sense. So here's my next attempt.ДЄnd that didn't work either! What went wrong? I gave exist a string input. No, we don't have anything exactly equivalent to a matlab struct array. That didn't work because exist expects string input. so I can capture any errors and easily show them. I'll begin by trying exist, and I am placing the code inside a try-catch. Remember, we want to check to see if the input is a struct and, if so, that it has fields time and amplitude. Snippet so I can figure out what code to put into snippet to do the error checking. Let's explore how I might check our different versions of the sunspot data to see which one or ones is suitable for use with Next let's get some data that is suitable for this function ( ss and ssExtra), and some that is not ( ssBad).Д¬hecking Inputs for Suitability with snippet with exist If either D.time or D.amplitude are missing, SNIPPET errors out. SNIPPET(D) plots data from a struct D which must contain the two fields: Let's look at the help for our function first: help snippet SNIPPET plots time vs. Give them enough information to correct problems without having to consult me too often. Since I intend to pass this M-file to lots of other folks, I want to write it somewhat carefully so errors the users make Suppose I'm writing an M-file to analyze data that I expect to come in a struct with two fields, named time and amplitude. Checking Inputs for Suitability with snippet with exist.

Struct in matlab 2012