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[solved] difference between 2 spectrograms
Spectrogram called without input arguments seems to plot log10 of the power. try this: im = pcolor(h/1000,(t/60),log10(abs((s')...

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ODE45 Solution for a coupled equation
When running your function I get an initial growth of T, which is due to the k_ISC*n(1) term in your ode - that would represent ...

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How can I create a subplot of ode45 for a mass spring damper where the two plots have a different k value?
Simply add another parameter to your msdfunc for k: function zprime= msdfunc(t,z,k) m = 4; b = 0.25; if nargin < 2 || isempty...

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Solving nonlinear diferential equations system
That's a system of coupled first-order ODEs. Have a look at the help and documentation for ode45, ode23. HTH

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How to generate Publication quality( for conferences/Journals) figures in MATLAB?
In the File menu go to print preview - from there you can set a number of different behaviours of matlab's print. Then print you...

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How to perform convolution with a dataset?
In matlab this should be as simple as f = A*(C*exp(alpha*t + D*exp(beta*t))); % or whatever you have for that part. G = psf; ...

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Plot a scalar as a function of a parameter
It should be as simple as: for n = 1:N for t = 2:T pipiVal(1,n) = pipiC(t,n); % or however you get the phipi-values cor...

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How do I create a colormap for a flat plane?
Use something like this: surf(x,y,z-1,x+0.5*y),shading flat You can use whichever linear combination of x and y to have your g...

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PLOT THE GRAPH OF VECTOR FUNCTIONS
So you want to plot a vector-function , where gives you 3-element vectors at points in 3-D space. For that you might get what...

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How do I plot interpolated grid data and original datapoint set in the same plot?
You can always simply plot all your points: plot3(Xi,Yi,Zi,'r.') Or with scatter: scatter(Xi,Yi,32,Zi,'filled') But to me th...

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How to save figures from foor loop in separate folders
Generate your file-names with fullfile (that way you can have multiple directories in a cell-array, one for each of your wanted ...

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How to integrate a function u^3/(exp(u)-1) in the range of [0 0.033]??.
if numerical integration is good enough: Val = integral(@(x) x.^3./(exp(x)-1),0,0.033) % for which I get: 1.1831e-05 HTH

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maximum value in scatter plot
Well that sounds like a task for histogram2, or any of the number of 2-D histogram functions available on the file exchange. The...

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Create coordinates on a convex hull
Perhaps this function is overkill, but to me it seems as if this FEX-contribution should help: xy2sn, I don't know if it is the...

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how to draw a 3d surface of exp(x+iy)
Have a look at the dcolor submission to the file exchange. That should give you a good starting point for doing this. There ar...

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Rotate 3D quiver
Matlab uses right-handed coordinate systems (sensible), with the default convention that z is in the upward vertical direction i...

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Visualization of Euler angles
Maybe something as simple as plotting the unit-vectors before and after a rotation? That is something you can easily adapt and ...

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How do I declare and iterate a variable in an ODE driver file?
The way I read your ODE-function your Snh_in_1 is the initial value of the second component of y. If so it should be no more dif...

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Plotting a 2D crystal lattice from two primitive lattice vectors
If you do it stepwise it becomes "not too tricky": e1 = [-0.5; -sqrt(3)/2]; % Your unit e2 = [1; 0]; % vectors ...

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How to do matrix or table multiplication?
Looping seems simplest and most easily readable for humans: szI = size(IntakeTable); szE = size(ExhaustTable); resultTable = ...

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This how i want the plot to be
pcolor(x,y,I),shading flat,xlabel('x-text'),ylabel('y-text'),colorbar HTH

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How to store large data sets with different types of information?
If you're planning to run all analysis in matlab why not just store everything in a .mat-file. In this scenario just have a sit-...

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indepvar and depvar are of inconsistent sizes with polyfitn
Yes, you send in an array [x1,x2] of size [1 x 20] and an array y of size [ 1 x 10] into polyfitn. The polyfitn version I have (...

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Can someone answer this?
Yes most people reading these pages can. You can too. Your learning experiece depends crucialy on your effort to learn. Check th...

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Plotting 4D data
Try something like this: t = M(:,1); x = M(:,2); y = M(:,3); z = M(:,4); scatter3(x,y,z,32,t,'filled') HTH

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Can anyone help in this error Error: The expression to the left of the equals sign is not a valid target for an assignment.
It looks like you should first check that the string generated by your strcat function call. To me it look like you generate an ...

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matrix multiplication error with too many variables in the equation .
Your first multiply are a matrix multiplication, you can achieve what you want if you make sure that C is a column-vector and t...

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Try using or tightening upper and lower bounds on coefficients.
For arbitrary fitting tasks I personally prefer to use weighted least-square minimization using some optimization function, if ...

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How to obtain variables from a structure inside a for loop?
It seems that you read in entire data-sets into a number of numbered struct-variables (presumably s_1, s_2,..., s_25). Dont do t...

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How to plot quiver with an input of Temperature data?
Presumably your heat-flux is just proportional to the temperature gradient (assuming constant and isotropic heat conductivity), ...

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