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Opariuc Andrei


Last seen: 2 years ago |  Active since 2020

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Curve fitting from the tools menu
First things first sorry for not translating my comments in the code (but if need be i will do so ) . Everything is functional...

2 years ago | 1 answer | 0

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Warning: Imaginary parts of complex X and/or Y arguments ignored.
Error when attempting to plot ,the first imaginary result comes from Q3 afterwards everything that involves Q3 results as imagin...

3 years ago | 1 answer | 0

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How to plot a curve between 2 data sets
%% input data P1=[2.3;3.9;3.5;4.8;5.5;6.3;7.4]; P2=[4.8;5.7;6.5;7.8;9.2;10.5;11.8]; D=[78;65;57;52;46;32;27]; %% Dp=P2-P1;...

3 years ago | 2 answers | 0

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how to get matlab to disply zero as the last value
% all functioning and all, i'm supposed to get 19 values for x,y,PmJ,KpJ but matlab is diaplaying only 18 values , % the 19 th ...

3 years ago | 1 answer | 0

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how to sum a result with multiple values
a=[170;115;110;70;80;100;140;65;80;99;48]; b=[40;20;27;20;18;20;30;14;13;22;17]; k=a./(a-b) k results in 11 values as inten...

3 years ago | 1 answer | 0

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error with sprintf add operation between 2 terms resulting in string
I used sprintf Mt1a to receive a value which someone not experienced with matlab would understand the value ,there appears to b...

3 years ago | 2 answers | 0

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sprintf conflict in operations
receiving 5 values for Mt2b while using sprintf for Pmax (i used to to get an exact value without variables) .if i remove sprin...

3 years ago | 1 answer | 0

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simple math with wrong results results
so i'm trying to reproduce some homework nothing too complicated ,simple stuff , when applying the formula for E i'm receiving 1...

3 years ago | 1 answer | 0

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plot not displaying figure
how can i plot func between the interval below , i don't have an image of the function anymore but the exact way the function wa...

4 years ago | 1 answer | 0

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line and column of the minimun element of a matrix
how do i find the position (line and column of the minimun element of a matrix) i have a matrix m= [5 1 -400; -6 100 -6; 2...

4 years ago | 1 answer | 0

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how can i determine angle between 2 variables
how can i do/calculate the angle like in the ss below ,i know rBx,rBy and g g=180/pi; teta1=300;teta2=320;teta3=40;teta4=10...

4 years ago | 1 answer | 0

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compacting a large number of plot lines
func0=@(x) 5/3*cosd(0)-5/2*cosd(x)+11/6-cosd(40-x); [phi0 valf]=fzero(func0,0); func20=@(x) 5/3*cosd(20)-5/2*cosd(x)+11/6-co...

4 years ago | 1 answer | 0

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dividing integrals using vpaintegral and syms
i'm supposed to do this and i wrote syms x r G=vpaintegral(x*r,0,1)/vpaintegral(r,0,1) % supposed to be approximately =0....

4 years ago | 1 answer | 0

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Integrating without using the symbolic toolbox
syms x f=log(45.*sin(x.^2) + cos(x)); % initial function g=sqrt(1+diff(f).^2); % requirement step 1 h=int(g,0,pi/2) ;% requi...

4 years ago | 1 answer | 0

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matlab commands/functions yearly
is there a way i can see which commands/functions come out each year ? for example i'm interested in commands that came out this...

4 years ago | 1 answer | 0

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ode45 too many input arguments
so i got a function which i did as home work a few days ago tested it ,it ran ,now it doesn't want to run anymore i don't know ...

4 years ago | 2 answers | 0

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Failure in initial objective function evaluation. LSQNONLIN cannot continue
so i'm supposed to do nonlinear regression to find the values of a,b and the equation y given the value of x small x=2.6 .i tri...

4 years ago | 1 answer | 0

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determine the values of 2 unknowns through nonlinear regression and predict value of equation
I have to determine the value of 2 unknowns a and b through nonlinear regression and predict the value of the equation y for x=2...

4 years ago | 1 answer | 0

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radius and height of a cylinder with given volume and cost per m^2
i've got a warehouse composed from a cylinder and a roof with the shape of 1/2 sphere and a total volume (i think , it wasn't s...

4 years ago | 1 answer | 0

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tried bisection method opinions ?
So i wrote a homework using the bisection method ,code functions, some opinions on if it's correct ? if not what should be impro...

4 years ago | 0 answers | 0

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what is wrong with the following code
i'm trying to do the jacobi method for some linear equations and i'm receiving NaN as a result %% Input data n=input('number ...

4 years ago | 0 answers | 0

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how to modify displayed result
so i've got my code all functioning and all,how can i get matlab do display/calculate the divisions from sol (solution)? if poss...

4 years ago | 1 answer | 0

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What is wrong with the code ?
i've got the base equations on the first 3 rows and the gauss-seidel on the last 3 rows , i tried writing a code that's like t...

4 years ago | 1 answer | 0

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Gauss-Seidel for solving linear equations
Apply 4 iterations, by the Gauss-Seidel iterative method, to solve the system of linear equations,Check the solutions by matri...

4 years ago | 1 answer | 0

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modifying/rounding/aproximating a number
i need a way to modify a number a=2.65987 into 2.6598 i tried round /fprintf , but both display as 2.6599 ,i need it badly ,i co...

4 years ago | 1 answer | 0

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b=fprintf how to
a=2.65987 ,after using the fprintf('%0.5g\n',a) i get the value i want being 2.6599 i tried doing b=fprintf('%0.5g\n',a) (...

4 years ago | 1 answer | 0

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how can i aproximate /modify long numbers
a=2.65987 b=abs(2.6599-2.65987) which equals 3.0000-e05 ,after using fprintf('%0.7f\n',Eabs) i got 0.0000300 how can i get from...

4 years ago | 1 answer | 0

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format short, format long, format short E, format long E, format rat
How can i represent a number let's say 1231312.1232323 with the formats long/short/long e /short e /rat more elegant or in a si...

4 years ago | 1 answer | 0

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Approximating /transforming /absolute error
input data r=3;h=8;Dv=0.1; Dr=(Dv/3)*(1/(1/3*pi*h*2*r)) the result is 6.6315e-04 , how do i transform /aproximate/etc the re...

4 years ago | 1 answer | 0

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