Iterative equation

[MartonTimea]

Hi. I would like to solve the equation below by iteration for ro_g=0.616, ro_a=1.2, Ho=2, Hd=1.5

Thank you for the help. Have a good day

[Werner_E]

Type it in using a boolean equal sign and use a solve block with Find() to get your solution.

Always better to post a worksheet rather than a pic!

[MartonTimea]

I will do so from now on. I am sorry i am quite new in the community. I have did what you said but i don't understand why it is not working. The worksheet is attached. Thank you.

[ValeryOchkov]

[AlanStevens · Accepted solution]

The equation you posted originally is different from the one in your worksheet.

Alan

[MartonTimea]

Yes. I appologize. I wrote a minus instead of plus. But thank you for the help. It is working now. Have a good day.

[Werner_E]

but i don't understand why it is not working.

The reason is that the solutions of the equation are complex numbers and this would require a complex guess value. If you use 2+2i as initial guess your sheet works.

You can also evaluate the solve block find() symbolically or use the symbolic "solve" command to get all two conjugate complex solutions. Neither of the two would need a guess value.

You have not only changed the values of the variables, compared to your initital post, but also the equation - I think the latter was not done on purpose.

See the attached sheets for further explanantions and the solution using your original information.