MATLAB Onramp 14.1 Project- Stellar Motion Task 7

Modify the Task 2 & 7 section of the script so that it performs the red shift calculation on the second star in spectra, not the sixth.

I have changed s to the second column (s= spectra(:,2)), and that is right.

How do I get the correct values of lambdaHa and speed?

[KATHIR]

Modify the task 2and7 section of the script so that it performs the red shift calculation on the second star in spectra,on the sixth

[KATHIR]

Add an else statement.if speed(v)is greater than 0, create lambda using a line width of 3. After the for loop is complete,enter hold off

[Ajithkumar]

Background

Line 2 of the script extracts the spectrum data for the second star in the matrix spectra. Then lines 3–5 calculate the speed based on that data. How would you calculate the speed of all the stars in spectra?

You could repeat the calculations in a for loop, but it is more efficient to use array operations instead.

TASK

Modify line 2 of the script. Calculate the speed of all the stars by deleting (:,2).

[Ajithkumar]

task 2-4

[Abhishek]

Add an else statement if speed (v) is greater than 0 create a plot of s against lambda using a line width of 3

Answer 1

[VAIBHAV PANDEY]

s = spectra(:,2)
[sHa,idx] = min(s)
lambdaHa = lambda(idx)
z = lambdaHa/656.28 - 1
speed = z*299792.458

[SIRAJ]

thanks bro...

[yash chawan]

this is not the right ans i have tried it

[Jayleen]

just take the second and third line for task 4

[Deeksha]

tast 2 & 7

s=spectra(:,2)

Did you store the second column of spectra in s?------> this error is not remove..why?

Answer 2

[Othello Deemi]

Could some kindly help me with Tasks 2&7 on the MATLAB Onramp on the topic "Project > Stella Motion"?

Here is my answer:

s = spectra(:,2)
[sHa, idx] = min(s)
lambdaHa = lambda(idx)
z = (lambdaHa/656.28) - 1
speed = z*299792.458 

I cannot go further beyond this point.  Many thanks.

[KHAOULA]

same prb

Answer 3

[Prabhan Purwar]

Hi,

The correct values for lambdaHa and speed are calculated using Task 4. At every Task whole of the script runs not the portion of the same.

Thanks

Answer 4

[PERUMALSAMY ROHANKUMAR]

[sHa,idx] = min(spectra(:,2))

to

[sHa,idx] = min(spectra)

[Ganisher]

how will be the next step's code?

Did you add a point to the existing axes?

Add a point to the existing axes by plotting x = lambdaHa, y = sHa as a red square ("rs") with a marker size ("MarkerSize") of 8.

[Ahmad Rohan]

help me pleace

[Öznur]

hold on

plot(lambdaHa,sHa,"rs",'MarkerSize',8)