MATLAB ® Online™ provides access to MATLAB and Simulink from any standard web browser wherever you have internet access – just sign in. It is ideal for teaching, learning and convenient, lightweight access. Collaborate Through Online Sharing and Publishing. Below is the syntax for Differentiation in Matlab: diff (A) diff (A, var) diff (A, n) Explanation: diff (A) will calculate the differentiation of A w.r.t variable provided by symvar (A, 1). Diff (A, var) can be used to calculate the differentiation of A w.r.t the desired variable, i.e. The variable passed as an argument. Diff (A, n) can be used to get the ‘nth’ derivative of the function. MATLAB ® Online™ provides access to MATLAB and Simulink from any standard web browser wherever you have internet access – just sign in. It is ideal for teaching, learning and convenient, lightweight access. Collaborate Through Online Sharing and Publishing. Keeping this slow down due to the interpretive nature of Matlab in mind, one programming construct that should be avoided at all costs is the for loop, especially nested for loops since these can make a Matlab programs run time orders of magnitude longer than may be needed. Often for loops can be eliminated using Matlab’s vectorized addressing.
| MATLAB Function Reference |
Special characters
Syntax
| Brackets are used to form vectors and matrices. [6.9 9.64 sqrt(-1)] is a vector with three elements separated by blanks. [6.9, 9.64, i] is the same thing. [1+j 2-j 3] and [1 +j 2 -j 3] are not the same. The first has three elements, the second has five.[11 12 13; 21 22 23] is a 2-by-3 matrix. The semicolon ends the first row.Vectors and matrices can be used inside [ ] brackets. [A B;C] is allowed if the number of rows of A equals the number of rows of B and the number of columns of A plus the number of columns of B equals the number of columns of C. This rule generalizes in a hopefully obvious way to allow fairly complicated constructions.A = [ ] stores an empty matrix in A. A(m,:) = [ ] deletes row m of A. A(:,n) = [ ] deletes column n of A. A(n) = [ ] reshapes A into a column vector and deletes the third element.[A1,A2,A3...] = function assigns function output to multiple variables.For the use of [ and ] on the left of an '=' in multiple assignment statements, see lu, eig, svd, and so on. |
| Curly braces are used in cell array assignment statements. For example, A(2,1) = {[1 2 3; 4 5 6]}, or A{2,2} = ('str'). See help paren for more information about { }. |
| Parentheses are used to indicate precedence in arithmetic expressions in the usual way. They are used to enclose arguments of functions in the usual way. They are also used to enclose subscripts of vectors and matrices in a manner somewhat more general than usual. If X and V are vectors, then X(V) is [X(V(1)), X(V(2)), ..., X(V(n))]. The components of V must be integers to be used as subscripts. An error occurs if any such subscript is less than 1 or greater than the size of X. Some examples are
See |
If X has n components, X(n:-1:1) reverses them. The same indirect subscripting works in matrices. IfV has mcomponents and W has n components, then A(V,W) is the m-by-n matrix formed from the elements of A whose subscripts are the elements of V and W. For example, A([1,5],:) = A([5,1],:) interchanges rows 1 and 5 of A. | |
| Used in assignment statements. B = A stores the elements of A in B. is the relational equals operator. See the Relational Operators page. |
| Matrix transpose 'any text' is a vector whose components are the ASCII codes for the characters. A quotation mark within the text is indicated by two quotation marks. |
| Decimal point. 314/100, 3.14 and .314e1 are all the same.Element-by-element operations. These are obtained using .* , .^ , ./, or .. See the Arithmetic Operators page. |
| Field access. A.(field) and A(i).field, when A is a structure, access the contents of field. |
| Parent directory. See cd. |
| Continuation. Three or more points at the end of a line indicate continuation. |
| Comma. Used to separate matrix subscripts and function arguments. Used to separate statements in multistatement lines. For multi-statement lines, the comma can be replaced by a semicolon to suppress printing. |
| Semicolon. Used inside brackets to end rows. Used after an expression or statement to suppress printing or to separate statements. |
| Percent. The percent symbol denotes a comment; it indicates a logical end of line. Any following text is ignored. MATLAB displays the first contiguous comment lines in a M-file in response to a help command. |
| Exclamation point. Indicates that the rest of the input line is issued as a command to the operating system. On the PC, adding & to the end of the ! command line, as in !dir &, causes the output to appear in a separate window. |
Some uses of special characters have M-file function equivalents, as shown:
Transpose Of Matrix In Matlab
| Horizontal concatenation | [A,B,C...] | horzcat(A,B,C...) |
| Vertical concatenation | [A;B;C...] | vertcat(A,B,C...) |
| Subscript reference | A(i,j,k...) | subsref(A,S). See help subsref. |
| Subscript assignment | A(i,j,k...)= B |
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See Also
The arithmetic operators +, -, *, /, , ^, '
The relational operators<, <=, >, >=, , ~=
The logical operators&, |, ~
| Logical Operators, Short-circuit && || | Colon : |
In Matlab Functions
In Matlab Meaning
Hi everybody,
I want to provide a solution for the above illustrating error messages.
First of all here are the corrections of the error:
- L11 and L33 expecting ';' : substitute cdecl by _cdeclor _stdcall(is also taken for calling)
- L19 'redeclaration...' : substitute
void mexFunction(int nlhs, mxArray *plhs,int nrhs, mxArray *prhs[]) by
void mexFunction(int nlhs, mxArray *plhs[ ],int nrhs, const mxArray *prhs[])
These corrections should solve the above mentioned problems. To me one new problem appeared in respect to the winmm.lib and playing the sound file. It seems the sound library 'winmm.lib' won't be linked to the rest of the code which leads to the following error:
Writing library for mythreadprog.mexw32
c:docume~1studilocals~1tempmex_4y~1mythreadprog.obj .text: undefined reference to '_PlaySoundA@12'
How can I resolve that error? The library in the batch file within the user settings of Matlab/MEX is already including the winmm.lib. I used the default LCC-compiler.
Thanks and regards,
Dennis