matlab

问题 Is there any way to do this? I know how to use saveas ( saveas(1, filename, 'pdf'); ) to save one figure to a PDF file, but is it possible to add multiples? So something like ( saveas(1,2,3) filename, 'pdf')); . Thanks 回答1: I don't think so - you need to increment the file name in some manner. I would use something like: for ii=1:3 saveas(ii,[filename '-' num2str(ii)],'pdf) end As a side note, I have had repeated difficulties when including the pdfs generated by matlab in a manuscript

问题 I have a normal vector that I calculated from the cross product of two vectors [xn,yn,zn] and I have a point[x0,y0,z0] how can I plot the normal in 3d. I didn't know how to do it. Any suggestions please? 回答1: With Arrow heads: a = [2 3 5]; % your point [x0,y0,z0] b = [1 1 0]; % your normal vector c = a+b; % end position of normal vector %quiver3 syntax: quiver3(x,y,z,u,v,w) quiver3(a(1), a(2), a(3), c(1), c(2), c(3)); axis equal; This will hopefully draw a vector from your point into the

问题 I have a normal vector that I calculated from the cross product of two vectors [xn,yn,zn] and I have a point[x0,y0,z0] how can I plot the normal in 3d. I didn't know how to do it. Any suggestions please? 回答1: With Arrow heads: a = [2 3 5]; % your point [x0,y0,z0] b = [1 1 0]; % your normal vector c = a+b; % end position of normal vector %quiver3 syntax: quiver3(x,y,z,u,v,w) quiver3(a(1), a(2), a(3), c(1), c(2), c(3)); axis equal; This will hopefully draw a vector from your point into the

问题 I want to solve a linear algebraic equation Ax = b using Eigen solvers. In my case, A is a complex sparse matrix(26410*26410), b is a real vector (26410*1). I use mex file in MATLAB to map the sparse matrix A and vector b to Eigen accepted format. The reason why I use Eigen solver is to hope it would be faster than solving directly in MATLAB using x = A\b . However, after tried LDLT, SparseLU, CG and BiCGSTAB, I found the results are not very satisfying: LDLT takes 1.462s with norm(A*x - b)

问题 I need to add a toolbox to my Matlab Student version. I know that I have to download the toolbox files, place them in some directory and then specify a path. However, I am not quite sure about where I have to place my files. I downloaded two zip archives: 'Symbolic Math Toolbox (Common) 5.10' and 'Symbolic Math Toolbox 5.10'. Where do I have to place them on Mac OSX Mountain Lion? How and where do I specifiy the path? Thank you all, this will help me a lot with my project! 回答1: Ok, I figured

问题 I need to add a toolbox to my Matlab Student version. I know that I have to download the toolbox files, place them in some directory and then specify a path. However, I am not quite sure about where I have to place my files. I downloaded two zip archives: 'Symbolic Math Toolbox (Common) 5.10' and 'Symbolic Math Toolbox 5.10'. Where do I have to place them on Mac OSX Mountain Lion? How and where do I specifiy the path? Thank you all, this will help me a lot with my project! 回答1: Ok, I figured

问题 Is there a way in Matlab to bring an axes to front without having Matlab perform a redraw ( drawnow ) implicitly? Background to my question: I am preparing a large figure with several subplots. In some of them I have 2 axes superposed, because I want to see the same data on 2 different y-scales. After playing around with axes settings, I finally got the figure to look like I expected. But: I need to bring one of the axes to front (in my case, the left axes hAxL). So I have this line in my

问题 I'm trying to use ode45 to solve a system of ODE's: [X,Y]= ode45(@sys,[0, T],y0); where, function dy = sys(t,y) dy(1) = f_1(y) dy(2) = f_2(y) dy(3) = f_3(y) end The problem is that the function ode45 requires that y0 be initial values [y_1(0), y_2(0), y_3(0)] , while in my system, I only have the values [y_2(0), y_3(0), y_3(T)] available. Mathematically, this set of initial/terminal conditions should be enough to pin down the system, but is there any way I can work with that by ode45 or any

问题 I have a calendar, typically a csv file containing a number of lines. Each line corresponds to an individual and is a sequence of consecutive values '0' and '1' where '0' refers to an empty time slot and '1' to an occupied slot. There cannot be two separated sequences in a line ( e.g. two sequences of '1' separated by a '0' such as '1,1,1,0,1,1,1,1'). The problem is to minimize the number of lines by combining the individuals and resolving the collisions between time slots. Note the time

问题 I am trying to use the Computer Vision System Toolbox to calibrate the pair of cameras below in order to be able to generate a 3-D point cloud of a vehicle at a range between 1 to 5m. The output image size was approximately 1 MB per image for the checkerboard calibration images and the checkerboard square size was 25 mm. The cameras used were a pair of SJ4000 HD1080P cameras. The cameras were placed as parallel to each other as possible with no angle in the vertical axis. The checkboard