Sum Matlab from 0 to 10000 on function [closed] - matlab
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syms k
S1 = symsum(1/((2*k)+1)^2,k,0,1000)
The result is this
59039372973827482202940226722672826425297321906316082356858983822169051832268260251807527611479190413293513875429587706186073872918905490907386679472102966658686481651660967093301512141946288248492833396616338323741632085379508599235923841007033467883638349122388806376761808189104503262045883240287482992169819848342303098664924237976221795758421152603069387903705445513260596627332283139648508194960733619500093010571517561429904500013876585156927070119332440687162376758374919870699278800835146651318465663183182583101377584105366558079836223068786457324044080570317649838092783113721959819118571747662368360095513856052974454509201490370810246175872510881504730747209788019551000695511879992198550955686739483474761130248789609061549535677663474218135370195381615899214931316241080337028498241295985409686314819267606796712968280842464845294917738460317179001491697993067157425958639996885239616893392960282441289069600101430806922004624472226999315951355963789249300352610312601262349650287009275097201871774652260892220551489305368617001974326978428202443548923140478853569492070442010110016068635424791389124439271253578545895132216218268847919848655110002938693346760862649668457282775860633067627110099340660770861888592018701206483696615682617062811616008107086256694453990688805738127607846586853460003073465075155412119309273843527076321601670400373937698518621100907936577387919537592519265365346619712200304996044229704602647674114176291753575322917531444831938509001759491229575945273985556769609288625450013634760596805884195325794441020339210402987018058377081579351119704065092777310976461961832919116412535470810011337916688085616171422473409544885864650134157327448050685723673514545806331081542320899927
It is a number in this form a/b
Why is this happening??
Do you know how to do this in octave too?
k = (0:1000);
k_sum = sum(1./((2*k)+1).^2);
disp(k_sum)
It's interesting that you jumped straight to using syms when the basic matlab functions work perfectly well for this problem. Why is that?
Related
How to create a a:d:b vector to create and display "sin(0), sin(pi/n), sin((2*pi)/n), . . . , sin(2*pi)]" [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago. Improve this question 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);
Why I get this Error? (State Space) [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago. Improve this question 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.
How can I extrapolate to higher values in Matlab? [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 7 years ago. Improve this question I have the following data: T=[0,100,300] and a=[2.8796,2.8785,2.886] and I want to extrapolate and know what a will I get at T=600 in Matlab. How can I do that?
If its linear the code below solves this
clear all
close all
T=[0,100,300];
a=[2.8796,2.8785,2.886];
reg = polyfit(T,a,1);
figure
hold on
plot(T,a,'bx')
plot(T,reg(2)+T.*reg(1),'k-')
plot(600,reg(2)+600*reg(1),'ro')
plot(600,interp1(T,a,600,'linear','extrap'),'md')
legend('observations','lin. regression','pred. at 600p polyfit','pred. at 600p interp1')
val_polyfit = reg(2)+600*reg(1)
val_interp1 = interp1(T,a,600,'linear','extrap')
diff = val_polyfit/val_interp1
yields
val_polyfit =
2.8924
val_interp1 =
2.8972
diff =
0.9983
For Linear Interpolation: aextra = interp1(T,a,600,'linear','extrap')
solve trigonometric equation using matlab [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 8 years ago. Improve this question How do you solve this equation in Matlab? beta=0:10:90 sin(tetha)+(3*cos(tetha)-1)*cot(beta)=0 Solve for tetha I used the solve function but didn't get any answer.
Check out fzero. beta = 0:10:90 for ii = 1:numel(beta) %% insert fzero function here end Columns 1 through 7 -0.9273 0.8777 -0.6248 -0.2930 0.8045 -0.9177 0.9141 Columns 8 through 10 -0.7869 0.2148 0.6605
Is there a way to get a function to perform the same operation on a list of variables in MATLAB? [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 8 years ago. Improve this question E.g. I'd like to perform a command like blitzer(blitzer(:,4)<0.5,5) on a list of variables (or all the variables in the workspace) in MATLAB. So I'd like to perform it on comet, dasher, etc...
Use the who function:
s = who;
for i = 1:length(s)
temp = eval(s{i});
answer{i} = temp(temp(:,4)<0.5,5);
end