Matlab - hothero's TechNote

Matlab Mex Setup Solution

在MATLAB上用mex編譯C/C++檔案是稀鬆平常，但卻又常困擾著開發者。不外乎就是找不到gcc或是找不到Standard Library中的header file，像是stdlib.h, stddef.h等等。諸如以下發生的錯誤訊息： /Applications/MATLAB_R2011b.app/bin/mex: line 305: gcc-4.2: command not found /Applications/MATLAB_R2012a.app/extern/include/matrix.h:852:20: error: stdlib.h: No such file or directory 筆者的開發環境：

C#

[Snippets]Passing a Bitmap from C# to a MatLab dll

此篇著重在C#傳遞灰階的bitmap影像資料給matlab dll的程式碼，至於如何編譯與使用matlab dll請參考本站文章build .net assembly dll for c# use by MATLAB r2011a和matlab dll usage on Visual Studio 2011。 C# ``` Bitmap bitmap = gray.ToBitmap(); int width = bitmap.Width; int height = bitmap.Height; double[,] = new double[height, width]; for (int i = 0; i <

TroubleShooting

[Troubleshooting] MATLAB mex file running error "The specified module could not be found."

MATLAB是MATrix LABoratory的縮寫，是一款由美國The MathWorks公司出品的商業數學軟件。MATLAB是一種用於算法開發、數據可視化、數據分析以及數值計算的高級技術計算語言和交互式環境。除了矩陣運算、繪製函數/數據圖像等常用功能外，MATLAB還可以用來創建用戶界面及與調用其它語言（包括C，C++和FORTRAN）編寫的程序。(from wiki.) MATLAB不只矩陣運算處理快速、方便，也有許多toolbox可以使用，但伴隨而來就是肥大的開發環境，與執行效率的問題。因MATLAB本身是由c語言架構而成，故可將需要較佳處理效能的函式以c語言撰寫，並透過g++編成MEX-file供MATLAB使用。 ??? Invalid MEX-file 'D:\machineLearning\private\distSqrPairwiseMex.mexw64': The specified module could not be found. 很多時候這些MEX-file不只是自己使用，也會publish給其他人使用，但每台電腦的環境都不同，有些人就會出現上述的錯誤訊息&

Matlab

Setting mex option of MATLAB on MAC to xcode compiler for solving many mex errors

mac的matlab時常在編譯mexfile發生錯誤，不外乎幾個問題：找不到gcc、找不到header files等等，一個最簡單的方式即是將matlab的mex compiler設定成xcode的compiler。筆者環境為：MATLAB R2011b、OSX 10.7.4。設定 ``` vi ~/.matlab/R2011b/mexopts.sh 在約167行處或使用'/SDKROOT'搜尋，將SDKROOT的值改成" SDKROOT='/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/' "，存檔後即可。註：若環境不同需確認指令的matlab版號與SDKROOT路徑。

C#

matlab dll usage on Visual Studio 2011

You can see an article about how to build .net assembly on MATLAB. Here we involve two matlab types, MWArray and MWNumericArray. Suppose matlab ne project name : projname class name : classname function name : func，with an argument : 2D matrix and output also is 2D

image

Convert .NET Image to 1/3D double array

I have a requirement that convert a .net image to 3D(or 1D) double array for MATLAB use, but didn't find any related article about this. So I reference this to do that. This is my code(image to 1D array): Bitmap bitmap = new

C#

build .net assembly dll for c# use by MATLAB r2011a

Environment： Windows 7 MATLAB r2011a (version 7.12) Visual Studio 2010 .Net Framework 4

TroubleShooting

TrubleShooting : OpenCV "the node does not represent a user object" & "unresolved external symbol _cvHaarDetectObjects referenced"

Development Environment : MATLAB R2011a OpenCV 2.2 Mex "the node does not represent a user object" Solution: [Option]refer this official article step 11 The error looks like this: Unspecified error (The node does not represent a user object (unknown type?)) in function cvRead,

OpenCV

Build opencv 2.2 using mex with VS2010 on matlab r2011a

網路上這類文章不下少數，而本篇文章將著重在如何將opencv2.2版利用VS2010的編譯器，用mex編成matlab r2011a版可呼叫的file（新版本所修改的地方）。（註：mex為一編譯器，可將c/c++程式編成為matlab執行檔）編mex不外乎幾個步驟：安裝Visual Studio 2010, MATLAB r2011a, opencv 2.2 setup matlab中的mex 可參考：http://blog.yam.com/dainn/article/26676311 編輯matlab的mexopts.bat ( C:\Users\hothero\AppData\Roaming\MathWorks\MATLAB\R2011a ) 在"set MATLAB=%MATLAB%

Subscribe to hothero's TechNote