MATLAB: How to substitute some elements from a vector

if statementreplacevector

Hello everyone!

If i have the next vector Z=[10;10;10;11;11;13;13] which is associated to another vector: X=[1;6;65;34;21;73;14] a nd I want to create a third vector, Y, with almost all the elements in X, but just replacing a 0 in X BEFORE the element (i,j) from Z changes. How can I do this? In this example my desire outcome would be the next vector Y=[1;6;0;34;0;73;14]

Thanks a lot for your help!

Best Answer

Y = X;
Y([diff(Z(:))~=0;false]) = 0

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MATLAB: Max value in a repetitive vector

maxes = [vec( diff( vec ) < 0 ), vec(end)];

works if it is as structured as your example always, where vec is your vector. If it isn't always an increasing set of sequences like that please give an example of a more general kind.

MATLAB: How to use fsolve function

eqn1 = @(x0, y0, z0) (-4.71777*10^21)+(2.10263*(10^15)*x0)-(3.49196*(10^8)*(x0^2))+(28*x0^3)+(1.56321*(10^14)*y0)-(3.76035*(10^7)*x0*y0)-(1.16399*(10^8)*y0^2)+(28*x0*y0^2)+(1.11156*(10^15)*z0)-(2.6739*(10^8)*x0*z0)-(1.16399*(10^8)*z0^2)+(28*x0*z0^2);
eqn2 = @(x0, y0, z0) (-7.62057*10^20)+(1.56321*(10^14)*x0)-(1.88017*(10^7)*x0^2)+(1.16012*(10^15)*y0)-(2.32797*(10^8)*x0*y0)+(28*(x0^2)*y0)-(5.64052*(10^7)*y0^2)+(28*y0^3)+(1.7955*(10^14)*z0)-(2.6739*(10^8)*y0*z0)-(1.88017*(10^7)*z0^2)+(28*y0*z0^2);
eqn3 = @(x0, y0, z0) (-5.41882*(10^21)+(1.11156*(10^15)*x0)-(1.33695*(10^8)*x0^2)+(1.7955*(10^14)*y0)-(1.33695*(10^8)*y0^2)+(2.41161*(10^15)*z0)-(2.32797*(10^8)*x0*z0)+(28*(x0^2)*z0)-(3.76035*(10^7)*y0*z0)+(28*(y0^2)*z0)-(4.01085*(10^8)*z0^2)+(28*z0^3);
fun = @(x) [eqn1(x(1), x(2), x(3)); eqn2(x(1), x(2), x(3)); eqn3(x(1), x(2), x(3))];

now you can fsolve(fun, x0)

Best Answer

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MATLAB: Max value in a repetitive vector

MATLAB: How to use fsolve function

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