How do you make an equation from a graph in Matlab?

How do you make an equation from a graph in Matlab?

How to get equation from each plot?

1. a=polyfit(wkt,x);
2. b=polyval(a,wkt);
3. figure.
4. plot (wkt,x)
5. hold on.
6. plot (wkt,b)

How do you make an equation in Matlab?

To insert an equation interactively:

1. Go to the Insert tab and click Equation. A blank equation appears.
2. Build your equation by selecting symbols, structures, and matrices from the options displayed in the Equation tab.
3. Format your equation using the options available in the Text section.

How do you select a variable to plot in Matlab?

Select variables for plot

1. function f=callplot.
2. while in1~=’Y’||’N’;
3. in1=input(‘¿ You want to plot the variable X? (
4. if in1==’Y’ pl(1:2)=’t1,y1(:,1)’; elseif in1==’N’ a=1; end.
5. while in2~=’Y’||’N’;
6. in2=input(‘¿
7. if in2==’Y’ pl(3-2*a:4-2*a)=’t1,y1(:,2)’; elseif in2==’N’ b=1; end.
8. while in3~=’Y’||’N’;

How do you find the equation of a line in Matlab?

Just plug into slope intercept form (y = mx+ b) and you’ve got the equation.

How do you find the equation of a plot?

To find the equation of a graphed line, find the y-intercept and the slope in order to write the equation in y-intercept (y=mx+b) form. Slope is the change in y over the change in x. Find two points on the line and draw a slope triangle connecting the two points.

How do you write a quadratic equation in Matlab?

Quadratic question using the function command

1. Without using the roots command, write a function to calculate roots of the quadratic equation.
2. ax^2+bx+c.
3. Inputs to the function should be the coefficients a, b and c and output should.
4. be the roots. Test your program by setting a=2, b=3 and c= -1.

How do you input user equation in Matlab?

Direct link to this answer

1. str = input(‘Give an equation in x: ‘,’s’) ;
2. % the user types in, for instance 2*x^2-3*x+4.
3. x = input(‘Type in a value of x: ‘) ;
4. % the user types in, for instance, 2.
5. f = inline(str,’x’) ;
6. y = feval(f,x) ;
7. disp([‘”‘ str ‘”, for x = ‘ num2str(x) ‘, equals ‘ num2str(y)]) ;

How does Matlab calculate r2?

R 2 = S S R S S T = 1 − S S E S S T . R a d j 2 = 1 − ( n − 1 n − p ) S S E S S T . SSE is the sum of squared error, SSR is the sum of squared regression, SST is the sum of squared total, n is the number of observations, and p is the number of regression coefficients.

How do you find the slope of data in Matlab?

calculate slope from linear fit data

1. x = 1:10;
2. y1 = [1 5 7 8 9 15 16 12 18 20];
3. scatter(x,y1,’b’,’*’)
4. P = polyfit(x,y1,1);
5. slope = P(1)
6. intercept = P(2)
7. yfit = P(1)*x+P(2); % P(1) is the slope and P(2) is the intercept.
8. hold on;

How do you create a graph in MATLAB?

Steps Know a few things about MATLAB. Open MATLAB. Create a new Function file. Set up your Function file. Set up your data. Now set up your graph. Make sure the final line in your function file is “end” and save your file. Execute the function. View the results.

How do I plot a function in MATLAB?

Steps Open MATLAB on your computer. Know what function you want to graph. Know what interval you want your function to be graphed on. Click inside the command window. Name the function. Set up independent variables. Type your function. Press ↵ Enter. Plot the function. Click back in the command window. Add label axes and title. Save the graph.

How do you use function in MATLAB?

Steps Open up MATHWORKS MATLAB and press the New Script button. Type your function name. Type the inputs of your function in between the parenthesis. Comment on what each input is. Type in the operation you want your program to do using your inputs. Use an fprintf statement to output the result of your equation.