Like cell arrays, structures can contain data of varying types and sizes. However, unlike cells and regular arrays, the elements of a structure object can be accessed by their assigned field names instead of a numerical index, as in numeric arrays and cells. This is the topic of this section below.Ī structure is a MATLAB data type in which the whole object has a name, just like regular and cell arrays. There is yet another data type in MATLAB called structure, which has also counterparts in most other programming languages such as Fortran, C, C .Enclose indices in curly braces,, to refer to the text, numbers, or other data within individual cells. Enclose indices in smooth parentheses, (), to refer to sets of cells - for example, to define a subset of the array. There are two ways to refer to the elements of a cell array. Cell arrays commonly contain pieces of text (string), combinations of text and numbers from spreadsheets or text files, or they can contain arrays of numeric arrays of different sizes. Just as with cell values, a cell array is a data type with indexed data containers called cells. When we want to define a variable whose elements are not all of the same types, we need an entity that goes beyond the capabilities of matrices, which can only contain numeric values. blkdiag: Create a block diagonal matrix from existing matrices.repmat: Create a new matrix by replicating and tiling existing matrices.vertcat: Vertically concatenate matrices. ![]() horzcat: Horizontally concatenate matrices.cat: Concatenate matrices along the specified dimension.The following functions combine existing matrices to form a new matrix. Later on, we will see how this function can be used to generate fancy looking graphs like the following, Matrix concatenation functions Vector and matrix variablesĪgain, similar to vector and matrix values, everything holds for the same type variables. Basically, everything that we have said about number values, holds also for variables of type number. We have already extensively discussed number values. It represents the smallest number that can be represented by your MATLAB software.Ī special variable that MATLAB uses to store the result of MATLAB's command line. Represents the result of a meaningless mathematical function, like $0/0$.Ĭontains the current date and time in the form of a 6-element row vector: year,month,day,hour,minute,second.Ĭontains a string representing today's date. Represents the mathematical Infinity concept, for example, a result of division by zero. The number $\pi$ up to 15 significant digits. ![]() A list of predefined values and variables in MATLAB. Here is a list of some of the most important predefined variables in MATLAB,
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