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How to find relevent principal component .

Calculate the quantity: cumsum(evalues)./sum(evalues) The will show you the cumulative variance explained by keeping the...

ungefär 11 år ago | 0

| accepted

How to Cope XLS Worksheet using Matlab

Hi Bill, you can use dos commands from within MATLAB to copy the file: original_file = 'orginal_file_name'; copied_file ...

ungefär 11 år ago | 1

sorting a time series

You need to use the optional output from the sort function that contains the sort order. [Y, idx] = sort(time_series); Z...

mer än 11 år ago | 2

| accepted

Apply a mask to 4D medical images in a vectorized way

Something like this: fV = V.*M(:,:,ones(1,size(V,3)),ones(1,size(V,4))); Conrad

mer än 11 år ago | 1

Passing a matlab array into C# DLL

Hi John, what about creating a wrapper method with signature double[,] RGBConvertWRP(int ncols, ...

mer än 11 år ago | 0

Sorting multi Dimension matrix

Hi, you need to sort along the third dimension: % Create dummy data. fset(:,:,1) = rand(5,16); fset(:,:,2) = zeros(5...

mer än 11 år ago | 0

| accepted

Delete a cell by a criterion???

Hi Thor, try the following: % Create dummy data. S = cell(1,2,2); l1(288,3).Value = 1; l2(280,3).Value = 1; ...

mer än 11 år ago | 0

| accepted

How do I insert values into my bar plot (with 2 columns per x value)?

You can try something like this: A = [1 2 3 4 5]; B = [4 7; 2 9; 3 7; 4 8; 1 3]; bar(A,B); xOffsets = [-0.16...

mer än 11 år ago | 0

ask for reference of SOM and clustering using Matlab

For an introduction see: <http://davis.wpi.edu/~matt/courses/soms/>. You could also try the toolbox: <http://www.cis.hut.fi/p...

mer än 11 år ago | 0

Change equation in fsolve inside a loop

Try using anonymous functions: f1 = @(x) [x(1)+x(2)*x(2)+7*x(3) ;log(x(1))+exp(x(2))+x(3);3*x(1)+x(2)*x(3)+2]; f2 = @(x)...

mer än 11 år ago | 0

| accepted

write variable in symbolic way

Try this: g = 1; x = ones(1,10); A = @(i) x(i+3*g)/(x(i+4*g)+x(i+5*g)); You can then use A(1) etc...

mer än 11 år ago | 0

plz anyone solve the following question for me in matlab and reply quick.regards

Try this X=[-4 -1 0 2 10]; Y=[-5 -2 2 5 9]; [~,idx] = find(X>Y);

mer än 11 år ago | 0

sum a column depending on another column

Something like this: % Dummy data. A =[ NaN 6 NaN 1;... NaN 9 NaN 0;... NaN 10 NaN 1]; idx = A...

nästan 12 år ago | 0

Make no space between axes of a figure with boundaries of that figure windows

You could do the following: h1=figure; plot(rand(10)); set(gca,'Position',[0 0 1 1]);

nästan 12 år ago | 1

| accepted

problem with an if statement

Okay, think I know what you mean... this should do it. c5 = [A(2:end,5); NaN]; idx = ((A(:,4)==1)|(A(:,4)==2))&(A(:,...

nästan 12 år ago | 0

| accepted

Recommended steps to deal with a slow loop

I would recommend that you first focus on what happens inside the for loop... why is it taking so long? Get a complete breakdown...

nästan 12 år ago | 0

How to find equation of curve if just graph is given

You will have to make some assumptions about the functional form of the curve... for example if you know the curve is of the for...

nästan 12 år ago | 0

Mapping a graph on a sphere.

See the code below. It shows how to do it for two points but this is really all you need, just do the same for the other points....

nästan 12 år ago | 1

how can i define an array with different increments?

Something like this t = [ 0:0.1:1,... % increment of 0.1 1.2:0.2:4,... % increment of 0.2 4.3...

nästan 12 år ago | 1

Xlsread and xlswrite; easy small help

You could try this: excelFileName = 'Test.xls'; f1 = sin((0:360)*pi/180)'; success = xlswrite(excelFileName,p); ...

nästan 12 år ago | 0

| accepted

Initialization of array of structure

The following code should do the trick: function is = StructInit(s) is = s; if isstruct(s) ...

nästan 12 år ago | 0

plotyy does not what i want...

Hi Florian plotyy(x1,y1,x2,y2) The length of y1 must be the same as x1 and the length of y2 must be the same as x2 but x...

nästan 12 år ago | 0

| accepted

how to change the colors of bars in a bar graph?

You could try a similar approach to the one given below (just extend it for your purposes): p1X = [1 2 3]; p1Y = [1 4 5];...

nästan 12 år ago | 2

| accepted

In a cell with matrix entries, loop through to delete empty matrices

Let R denote your cell array that contains the matrices, then the following should suffice: K = R(~cellfun(@isempty,R))...

nästan 12 år ago | 1

| accepted

In a cell with 255x1 entries, find the intersection of each entry list with all other entry lists

Hi Rebecca, you could try this: C = { [ 1 2 3; 4 5 6; 2 3 1]; [ 1 3 3; ...

nästan 12 år ago | 0

| accepted

strings comparison with if then in array

Hi Udiubu, you can use strcmp: strcmp(alpha(x,7),'miss') You can also get rid of the for loop by using logical indexing;...

nästan 12 år ago | 1

| accepted

problem in inserting a diagnol

A = [ 1 2 3;... 4 5 6;... 7 8 9]; A(1:(length(A)+1):numel(A)) = 2*diag(A);

nästan 12 år ago | 0

How to make a simple gui to plot a scatter graph?

Hi Kokalz, the code below should get you started: function DemoGUI() % Initialise variables: excelFileName = ...

nästan 12 år ago | 1

| accepted

How can I color code lines in graphs depending on quality of data?

Hi Viktor, you can try something like this: t = 0:0.001:2*pi; x = [sin(t);2*sin(t)]'; y = [cos(t);2*cos(t)]'; % Create d...

nästan 12 år ago | 0

how to add the sequences in the mat lab?

Did you mean something like this? A = [1 2 3 4]; B = [1 2]; B = [B zeros(1,length(A)-length(B))]; B will the...

nästan 12 år ago | 0

| accepted