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I have 2 data set point cloud and I want to crop a part of them together.
Because of volume of them is too too large I couldn't crop them with below codes.
Can you help me to how can I crop them?
Used codes are:
selectedl=[];%% last pulse
for i=1:size(indexl)
selectl=lr(indexl(i),:);
selectedl=[selectedl;selectl];
end
selectedf=[];%% first pulse
for i=1:size(indexf)
selectf=fr(indexf(i),:);
selectedf=[selectedf;selectf];
end
Thank U all.
It is a bit difficult to understand what you want to do, as lr, fr, indexl and indexf are missing.
But assuming something like
lr = rand(5,3) ;
indexl = [2 5] ;
I would advise to allocate selectedl above the loop
selectedl = NaN(length(indexl),size(lr,2)) ;
for i = 1:length(indexl)
selectedl(i,:) = lr(indexl(i),:) ;
end
This might not be needed for this example, but if the data size becomes larger this will speed up the loop.
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I have been trying for a while to get this to work but I don't seem to be getting any closer to a solution.
I'm not sure of what the pattern is and what to write for the "d" value in a:d:b
Clearly you want to start from 0 (a) and go to 2*pi (b).
Now the question comes what is your step size (d)?
From your example you can see that you are changing from 0 to pi/n.
And from pi/n to 2*pi/n.
This means your step size is d=pi/n
Once you defined your n, e.g:
n=10;
you can do the rest like this:
x=0:(pi/n):(2*pi)
y=sin(x);
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I have Non-linear Fitting function like:
prate ~ (m1-((m1-m2)/(1+(IC50/(conc)))))
And a table:
[I] (µM) Max polymerization rate
25.00 3.08
12.50 3.30
6.13 4.44
and IC50 = 1.87
I want to create a function like the one above and use this data to make a plot. Is that possible?
This might help you get started.
You need to define your function using handles.
Say you have a variable PolymerRate you want to estimate and conc as input variable, I think in your case would be something like:
IC50 = 1.87;
prate = #(m,conc) (m(1)-((m(1)-m(2))/(1+(IC50/(conc)))));
m0 = [1 1];
[m,resnorm,~,exitflag,output] = lsqcurvefit(F,m0,conc,PolymerRate);
plot(conc,PolymerRate,'ro')
hold on
plot(conc,prate(m,conc))
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Could someone explain me what I must change in my model?
Model
The error messages are pretty clear and self-explanatory. The reason you get the error is because B is of dimension 4x2 and you are trying to do B * Xr where Xr is of dimension 1. According to your equation, you need to do B*U where U = [dXr/dt; Xr];. However, using the derivative block is never a good idea in Simulink if you can avoid it, especially with a step input. Think about how you want to formulate the inputs to your state-space.
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I want to my program give a image to user and user by mouse choose a pixel,then spatial information of pixel return to program for another process.
how write code for it in matlab ?
Try this:
A=imread('your image');
imshow(A);
impixelinfo;
[c, r, vals] = impixel;
c and r are arrays of all the columns and rows of the part of the image that user clicked on and vals are the RGB values of each point.
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This figure illustrates my problem:
t (in the X1 calculation) value changes from 0 to etz. If its value reaches etz it has to start from 0 again and again.
This situation has to continue during simulation (I need a loop!). However, t is simulation time and I cannot force it to be zero. So maybe I need a parallel time to the simulation time but I don't how to create it.
Use modulo operator.
http://www.mathworks.com/help/matlab/ref/mod.html
For example:
X1 = abs((mod(t,e*tz)-e*tz/2)/(1.125*c*tz))
This part:
mod(t,e*tz)
Will be >= 0 and < e*tz and will repeat the way you want.
In the future, please provide a better title for your question. Also, providing a screen shot of your code is not the preferred way to include code.