# Yogananda Jeppu

Professional Interests: Controls, Verification and Validation, Safety Critical, Aerospace, Formal Methods

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**Content Feed**

Index exceeds matrix dimensions

As a rule please use meaningful variable names. Simulink is a keyword. I get a feeling you are trying to store that data variabl...

3 years ago | 0

Aerospace and Flight Controls

https://in.mathworks.com/matlabcentral/answers/25688-modelling-and-simulation-of-a-flight-control-system This was answered long...

3 years ago | 0

| accepted

How can I easily give all of my simulink random number generators different but controlable seeds?

I use an array of seed say 10x1. In a for loop i use the datetime to pick a random seed and assign it to the seed array. This ge...

3 years ago | 0

Why my simulink model is running in R2018b but not in R2015a ?

You can try the Signal Specification block from Simulink >> Signal Attributes >>. Perhaps this will work. Enable data type and s...

3 years ago | 0

Why my simulink model is running in R2018b but not in R2015a ?

Do you use variable being passed inside as an array. The matlab function in the simulink may require the array size to be define...

3 years ago | 1

| accepted

Fitting simulink model with optimization toolbox?

I use a global variable for this and this works well. Define the tunable parameters in simulink as X array. X(1) is a gain in th...

4 years ago | 0

Calculate gain and phase margin on simulink

This is interesting. Can you define a time response equivalent instead (second order response) and tweak your controller to get ...

4 years ago | 0

Creation of a simulink block from a Mupad expression containing subscripts.

Use Mux block to get theta 1 ... N. You need so many inputs. The Mux will create the array for you. Take this as a single input ...

4 years ago | 0

| accepted

How to set flags in Simulink?

Is the problem correct? How can flag be 1 in the else condition? Can you provide the matlab code with proper indentations. Try a...

4 years ago | 0

Simulation Time and Date

Try and make a simulink block with 6 outputs Year, Month, Day, hr min , sec. Divide the clock block output with the respective s...

4 years ago | 0

Simulation Time and Date

Try and make a simulink block with 6 outputs Year, Month, Day, hr min , sec. Divide the clock block output with the respective s...

4 years ago | 0

How to run ode15s function for several times

Try a simple Euler integration. Xd = f(a,b,c ...). x = Xd*dt+x; store the values of x in an array. See if this works.

4 years ago | 0

I have an optimization problem where i need to minimize the Total_Cost. I have the equations in AMPL format and i need to convert it to MATLAB. Can anybody help and correct my answer?

sum1 = sum1 + tcn{i;j}; The ';' should be perhaps a ','. It is easier if you can represent as a matrix with [] square brackets. ...

4 years ago | 0

Threshold / Crossing algorithm given a signal

You can use the find function and get the first index where the data crosses the threshold. Set all that data from current locat...

4 years ago | 0

Iteration between GUI and Excel file

Try reading the excel file using xlsread, processing it in Matlab and use xlswrite to write back to excel file. The help is quit...

4 years ago | 0

Files not showing up in 'current folder'

I am not sure if this is the right answer. I see a '-' in the name. Can you change it to an underscore '_' and check?

4 years ago | 0

Having Trouble with While loop not renewing a value

A good idea would be to not use a while loop and give one or two data points as a check if all the steps are behaving as expecte...

4 years ago | 1

| accepted

Why am I not getting the table named SelectedTable as an output? How to rectify such errors in MATLAB?

Could you explain what you are trying to do?

4 years ago | 0

How do I determine transfer function from input/output data?

If it was filter sort of thing the TF would be available as a X(k+1) = A x(k) + B u(k) form. This would make sense to derive in ...

4 years ago | 0

problem using fminsearch, as parameters that I want to optimize is not input for the handle function

I am not sure how to do this. I have been using global in my function and optimizing using fminsearch (fmins before). It always ...

4 years ago | 0

How to get a for loop to update its iterations on a variable that can change.

Looks like you have the data and you are doing post processing. Try not to use the for loop. Use the find for the complete array...

4 years ago | 0

derivative block doesn't answer correctly.

You require a set of integrator. Your input is ddot(Y2ref) and dot(Y1ref). Use integrator in series to get ddot(Y2ref)->dot(Y2re...

4 years ago | 0

I need help modeling a Temperature controller for a furnace with PID on Matlab and SIMULINK with several conditions

You can use a rate limiter with variable limits. Put a logic to check the output temperature of the plant and change the rate li...

4 years ago | 0

| accepted

Simulink: too many input arguments

Check the number of inputs to the mux block. Check their dimensions. If the inputs to the block are three from one port you may ...

4 years ago | 0

| accepted

Code to compare cells with a range in MATLAB

Never use Matlab like a C code interpreter. Matlab has elegant function that help you do data manipulation very easily. You can ...

4 years ago | 0

how to write matlab code for following problem

*For the simulation* Make a large vector a multiple of 30 (why?). For the first set with probability of 50% make half the vecto...

4 years ago | 0

how to optimize an input variable to a function to obtain a set point output variable?

Hi I am not sure I fully understand the question. What are IC1(), IC2() etc. They could be some complicated functions. You can ...

4 years ago | 0

Submitted

A Three by Three Puzzle

Solve the 3x3 puzzle using Design Verifier

4 years ago | 2 downloads |

Submitted

The Schiaparelli Analysis

This is a simple analysis of the Schiaparelli failure using formal methods

4 years ago | 2 downloads |

Submitted

Formally Correct Control Elemental Blocks

This has a set of blocks which are formally correct in functionality

4 years ago | 1 download |