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Why is it always showing an error as phi is an undefined function for input argument type char ??
Sofiya, in your code above some of the variable names contain empty spaces (if the copy-paste worked), which is not valid. E.g. ...

environ 12 ans il y a | 0

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adding matrices with different dimensions
Dimitrios, you mean something like X = 1:50; theta = (1:180)*pi/180; mat = repmat(X',1,numel(theta)) - repmat(sin(...

environ 12 ans il y a | 0

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Attempted to access y(5); index out of bounds because numel(y)=2.
Jeppe, if I am not mistaken, |derivNL| defines a system of differential equations. If that's the case, change y = zeros(2,1...

environ 12 ans il y a | 0

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Figure ploting data problem
Giorgi, add after the |plot| command set(gca,'XTick',x,'XTickLabel',matrix1) to change the tick labels.

environ 12 ans il y a | 0

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vectors must be the same lengths error with subplot
Anna, you need to define |x1| and |x2| first before you can use the variables to compute |y1| and |y2|. Use something like x...

environ 12 ans il y a | 0

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get on click coordinates from a plot (multiple times)
Hello Max, check out this <http://www.mathworks.com/matlabcentral/answers/125687-update-vector-values-and-return-to-the-program#...

environ 12 ans il y a | 2

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Make my code for taking norm efficient
Muahmmad, why don't you read in all data from the Excels files at once (in other words you are only calling |xlsread| twice) and...

environ 12 ans il y a | 0

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ode45 not enough input argument
saramatlab, use function my_ode() %main code T0 = 293; T1 = 300; Tf2 = 293; a = 0.2; R = 1; % not define...

environ 12 ans il y a | 0

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What's the problem ? Help me
Nguyen, you probably do not have access to the Symbolic Math Toolbox. Use ver at the command prompt to get a list of all ...

environ 12 ans il y a | 0

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Wrong equastion of XY dependence
Use, x = -5:0.1:15; % create a vector x, element spacing: 0.1 a = 1; b = 12; c = 2.4; r = 1; y = -1*(a-b*(((x)-r...

environ 12 ans il y a | 0

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How to find the first 3 roots of sin(x)+0.5=0 bigger than zero? (Multiple roots)
Efe, that looks like a trick question... |sin(x)+5| cannot be equal to zero, since |sin(x)| is between -1 and +1.

environ 12 ans il y a | 1

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Simple Undamped Forced Vibration Problem
bugatti79, your code looks fine. In other words, you correctly implemented the differential equation and, yes, MATLAB does retur...

environ 12 ans il y a | 0

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How to plot a 3d plot (surf) from an XYZ table, X and Y coming from for loops?
hibou, use X = reshape(prev(:,1),[],2); Y = reshape(prev(:,2),[],2); Z = reshape(prev(:,3),[],2); surf(X,Y,Z)

environ 12 ans il y a | 0

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how to plot a specific column of a matrix
Amin, use plot(mymat(:,2)) where |mymat| is the matrix.

environ 12 ans il y a | 6

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time dependent parameter in ode-function matlab
Sejo, one fairly clean approach would be to split the integration interval: |[tdown 10),[10 11],(11 tup]| and call |ode45| three...

environ 12 ans il y a | 0

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How to combine two plots into one with separate markers
Jimmy, as a very efficient approach (if you only need to do it once) I recommend a simple copy-paste: # Open both figures # ...

environ 12 ans il y a | 26

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How to restore simulink model from the subsystem?
Hello Gautam, you can <http://www.mathworks.de/de/help/simulink/ug/expand-subsystem-contents-1.html expand> the subsystem. This ...

environ 12 ans il y a | 0

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Solving two systems of DEs using the ode45 function.
Vassil, check out function my_ode() alpha0 = 1; alpha1 = 1; beta0 = 1; beta1 = 1; lambda = 1; sigma = 1; pa...

environ 12 ans il y a | 0

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Rounding of a number/ text file format
missC, you could use instead x = 1:5; fid = fopen('corner.txt','w'); fprintf(fid,' %d\n',x); % > %d: write integer v...

environ 12 ans il y a | 0

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How can I change the line color in a graph using plot?
vivek, check out the <http://www.mathworks.de/de/help/matlab/ref/plot.html#inputarg_LineSpec doc> for starters, e.g. x = 0:0...

environ 12 ans il y a | 0

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Bug in matlab R2012b version
Scarzo, that's not a bug. Check out this <http://www.mathworks.de/matlabcentral/answers/69-why-does-1-2-3-1-3-not-equal-zero ans...

environ 12 ans il y a | 1

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Need to do ode45 for various values iteratively
Muahmmad, you are almost there. Use a loop and something like function myode() alpha = 10:15; figure hold all for ii...

environ 12 ans il y a | 0

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Is there a way to create all m files with already filled in some predetermined lines that are needed for every file like clear all; close all; author name etc?
Seetha, check out this <http://www.mathworks.de/matlabcentral/fileexchange/27132-automatic-template-for-new-functions File Excha...

environ 12 ans il y a | 2

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NI-DAQ device not recognised
Hello Helen, have you installed the NI-DAQmx Support Package? You can get it either from the MathWorks Hardware Support <http://...

environ 12 ans il y a | 1

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Error using dsolve function while solving differential Equation
Preethika, I do not know how you implemented it, so here is one approach: syms y(x) Dy = diff(y); D2y = diff(y,2); %...

environ 12 ans il y a | 0

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Can you share meeting materials from the MATLAB & Simulink Racing Lounge?
Yes, the material is available on the MathWorks Formula Student Germany <http://www.mathworks.de/academia/student-competitions/f...

environ 12 ans il y a | 0

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Subplots and thier Position (Expert needed)
Max, are you referring to cols = round(Ncam)/2+1; (I believe not)? If so, the code first divides by 2 and then adds 1 to ...

plus de 12 ans il y a | 0

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SUSPENSION MODEL NOT WORKING PROPERLY!
Jacobo, if it's supposed to be two stable, coupled mass-spring-damper systems, the signs are probably off. Check out the attache...

plus de 12 ans il y a | 0

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Store all iteration loop outputs in a matrix
UTS, use instead m(i,:) = [i j k]; The output is an array |m| with 10 rows, 3 columns.

plus de 12 ans il y a | 16

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fminsearch error regarding matrix dimensions
MiauMiau, the function |funct| has only one dependent variable, |x|, correct? If so this needs to be reflected in the function c...

plus de 12 ans il y a | 1

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