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foo.m

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+function y = foo(x,a,b)
+% Copyright 2011 The MathWorks, Inc.
+pause()
+ disp('1')
+ x(1) = x(1) + 12;
+pause()
+ disp('2')
+ y = a*x+b;
+pause

memmapexample.m

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+%% Introduction to Memory Mapping
+% Copyright 2011 The MathWorks, Inc.
+
+%% Map with default settings
+% Homogeneous uint8 binary file
+m=memmapfile('waferdata_uint8.bin') %#ok
+
+%% Notice Data size==file size
+fileinfo=dir('waferdata_uint8.bin');
+fileinfo.bytes
+
+%% We can access the file like it is an array
+m.Data(1:20)' %#ok First few elements
+
+%% Copy a piece an make it look like it was stored
+a=reshape(m.Data(1:100),20,5)'; 
+
+%% Access some in the middle
+m.Data(2^20:2^20+20)' %#ok some in the middle
+
+%% We can map the first 1MB
+m.repeat=2^20 %#ok Only one megabyte
+
+%% Or the second MB
+m.offset=2^20 %#ok only one megabyte
+
+%% Write to it
+m.writable=true    %#ok
+m.Data(5)=100;
+m.Data(1:20)'      %#ok
+
+%% Treat as n ND array
+m=memmapfile('waferdata_uint8.bin','format',{'uint8' [20 100] 'x'},'repeat',20*1000) %#ok
+% See it defaults to mapping the whole file as uint 8
+A=m.Data;          %#ok
+
+%% Change format
+m.format={'uint8' [1 4] 'headerbits';...
+          'uint8' [4 9] 'middle';...
+          'uint8' [7 1] 'tail'};
+A=m.Data           %#ok
+m.Data(1).headerbits

myfunc.m

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+function y = myfunc(x)
+% Copyright 2011 The MathWorks, Inc.
+y = sin(2*x.^2+3*x+4);

myfuncInPlace.m

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+function x = myfuncInPlace(x)
+% Copyright 2011 The MathWorks, Inc.
+%% This function can operate on data in-place if called correctly.
+x = sin(2*x.^2+3*x+4);
+

overhead.m

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+%% Memory Overhead for Different Kinds of Arrays
+% How much memory do different datatypes consume?
+% Copyright 2011 The MathWorks, Inc.
+%%
+% Set up 
+clear all
+clc
+%%
+d         = [1 2]
+dcell     = {d}
+dstruct.d = d
+
+%% Look at whos Output
+whos

overheadOnion.m

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+%% Example Showing Memory Overhead of Structures
+% Copyright 2011 The MathWorks, Inc.
+
+%% Load an image
+X = imread('onion.png');
+imshow(X)
+whos  % note that X is a 3-dimensional array
+
+%% Store one plane per field
+im1.red   = X(:,:,1);                % each plane is m x n
+im1.green = X(:,:,2); 
+im1.blue  = X(:,:,3);     
+
+%% Store one pixel per field
+[nr,nc,np] = size(X); 
+im2(nr,nc).pixel = [0 0 0];
+for row = 1:nr
+    for col = 1:nc
+        im2(row,col).pixel = reshape(X(row,col,:),1,3);
+    end
+end
+clear nr nc np row col
+
+%% Which one is bigger?
+whos im*

plotDemo.m

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+%   Copyright 2011 The MathWorks, Inc.
+%% a)
+% plot(data(1:100:end,1));
+% ylim([1 255]);
+
+%% b)
+%% Down sample rate
+downsample=1000;
+
+%% Downsampled max/min
+maxdata=zeros(1,size(data,1)/downsample);
+mindata=zeros(1,size(data,1)/downsample);
+
+for k=1:size(data,1)/downsample
+   section=data((k-1)*downsample+(1:downsample),1);
+   maxdata(k)=max(section);
+   mindata(k)=min(section);
+end
+
+combine=[mindata;maxdata];
+plot(1:.5:(numel(combine)/2+.5),combine(:),'g');
+hold on;
+
+%% Downsampled
+plot(data(1:downsample:end,1),'b');
+ylim([1 255]);
+hold off;
+
+%% Annotate
+title('Detect Trend');
+ylabel('Thickness');
+xlabel('Wafer #');

precision.m

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+
+%% One! singular sensation, with every little byte she takes
+%   Copyright 2011 The MathWorks, Inc.
+
+a =        1  ; % Double by default
+b = single(1) ;
+c = uint32(1) ;
+d =  int32(1) ;
+e = uint16(1) ;
+f =  int16(1) ;
+g =  uint8(1) ;
+h =   int8(1) ;
+
+%%
+i=sparse(2e9,1);

textscanDemo.m

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+
+%% Filename and Format string
+% This code loads in the contents of the data file with textscan a block at a
+% time and converts the cellarray from textscan into a double array
+% Copyright 2011 The MathWorks, Inc.
+
+filename='waferdata_start.csv'; 
+FormatString=['%*f%*f%*f%*f' repmat('%f',1,9) repmat('%*f',1,7)];
+
+%% Parameters
+Headers    =     3 ;
+NumLines   =   1e6 ;% Total number of lines to read
+BlockLines = 10000 ;% Size of block
+NumBlocks  = NumLines/BlockLines; % Number of blocks
+
+%% Open file
+fid = fopen(filename); % Open file
+
+%% Preallocate data
+data=zeros(NumLines,9); % Pre-allocate space for data
+
+%% Get Headers
+cellchunk=textscan(fid,'%s',3,'delimiter','\n'); % Get first 3 lines
+
+%% Read in blocks
+for Block=1:NumBlocks
+    data((Block-1)*BlockLines+(1:BlockLines),:) = ... 
+	cell2mat(textscan(fid,FormatString,BlockLines,'delimiter',','));
+    disp(['Block ' num2str(Block) ]); % Display current block to show progress
+end
+
+%% Close file
+fclose(fid);

textscanUint8.m

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+%% Filename and Format string
+% This code loads in the contents of the data file with textscan a block at a
+% time and converts the cellarray from textscan into a double array
+% Copyright 2011 The MathWorks, Inc.
+
+filename='waferdata.csv'; 
+FormatString=['%*f%*f%*f%*f' repmat('%u8',1,9) repmat('%*f',1,7)];
+
+%% Parameters
+Headers=3;
+NumLines=1e6; % Total number of lines to read
+BlockLines=10000; % Size of block
+NumBlocks=NumLines/BlockLines; % Number of blocks
+
+%% Open file
+fid = fopen(filename); % Open file
+
+%% Preallocate data
+data=zeros(NumLines,9,'uint8'); % Pre-allocate space for data
+
+%% Get Headers
+cellchunk=textscan(fid,'%s',3,'delimiter','\n'); % Get first 3 lines
+
+%% Read in blocks
+for Block=1:NumBlocks
+    data((Block-1)*BlockLines+(1:BlockLines),:) = ... 
+	cell2mat(textscan(fid,FormatString,BlockLines,'delimiter',','));
+    disp(['Block ' num2str(Block) ]); % Display current block to show progress
+end
+
+%% Close file
+fclose(fid);