# Esraa Abdelkhaleq

### Biophysics Department_ Faculty of Science_ Cairo University

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**Feeds**

Question

Why obtaining an error while displaying Runge kutta code

Hello, While I run out the code for Runge_Kutta, an error appears as "not enough input arguments" in line 2. 1 function...

6 years ago | 1 answer | 0

### 1

answerQuestion

Why curves don't appear in the numerical solution?

I want to solve an ODE system numerically. The numerical solution for the model equations should give two curves and four hlines...

7 years ago | 1 answer | 0

### 1

answerQuestion

Restoring the previous setting

Hello all, When I was using Matlab, there was one window for several tabs that display the code, but something has happened a...

7 years ago | 0 answers | 0

### 0

answersQuestion

The value of the crossing point between two curves?

How can I determine the exact value for the crossing point between two curves? Please see the attached figure. <</matlabcentr...

7 years ago | 1 answer | 0

### 1

answerQuestion

I want to know another line colors

I know these line colors: 'r', 'b' and 'm' Are there another line colors?

7 years ago | 1 answer | 0

### 1

answerQuestion

How to plot the log scale?

If I have the following code: syms t x ai di Kgr dc fc Rc fi_Ri Kei Kec fch_Rch_Nh0 fih_Rih_Nh0 g = @(t,x,ai,di,Kgr,dc,f...

7 years ago | 1 answer | 0

### 1

answerQuestion

Solving a system of ODE

Hello, How can I solve a system of two ODE's as follows, dNcdt= Nc(t)*Kgr- dc*Nc(t)*Ni(t) dNidt= ai*Nc(t) - di*Ni(t) ...

7 years ago | 1 answer | 0

### 1

answerQuestion

How to divide the parameters' ranges into subintervals?

If I have amodel equation: dqpldt=fc*Rc*Nc0*exp(Kgr*t)+(fi_Ri*(exp(-di*t)*(Ni0*di-Nc0*ai+Kgr*Ni0))/(Kgr+di))+(Nc0*ai*exp(K...

7 years ago | 1 answer | 0

### 1

answerQuestion

A code for performing local sensitivity analysis.

Hello, If I have a model equation containing some parameters, and I want to change the values of each parameter by 10% of the...

7 years ago | 0 answers | 0

### 0

answersQuestion

I want to do a parameter sensitivity analysis to my model

Hello, I have a model equation contains some parameters, I want to do a parameter sensitivity analysis to some parameters to ...

7 years ago | 0 answers | 0

### 0

answersQuestion

Plotting a relation between parameters and time.

If I have a model equation, dqidt=(fi_Ri*Nc0*ai\(Kgr+di))*(exp(Kgr*t)-exp(-di*t))+(fi_Ri*Ni0*exp(-di*t))+fih_Rih_Nih-Kei*qi ...

7 years ago | 0 answers | 0

### 0

answersQuestion

how to plot a figure containing multiple curves for the same parameter with different values?

If I have a model equation containing ,for example, 4 parameters and I want to plot 4 figures each one for each parameter with t...

7 years ago | 0 answers | 0

### 0

answersQuestion

Undefined function when trying to open sensitivity analysis tool

When I try to open the sensitivity analysis tool by typing: ssatool('modelname') as it is mentioned in the documents for t...

7 years ago | 0 answers | 0

### 0

answersQuestion

Plotting multiple curves for the same parameter on the same graph.

Hello, Unfortunately, I have asked a question about parameters sensitivity analysis, but I did not receive any answer. No...

7 years ago | 0 answers | 0

### 0

answersQuestion

Solving an ODE numerically .. What is the problem in my code?

Hello, I want to solve this ODE numerically.. dq_pl/dt=f_plc*R_c*N_c0*exp(K_gr*t)+f_plh*R_h*N_h0-K_el*q_pl(t). Where th...

8 years ago | 1 answer | 0

### 1

answerQuestion

Why 'solve' function does not work with me

I want to solve this Eqn for qpl(s): L(s) = qpl(0) - Kel*qpl(s) - s*qpl(s) + (Nh0*Rh*fplh)/s - (Nc0*Rc*fplc)/(Kgr - s) ...

8 years ago | 1 answer | 0

### 1

answerQuestion

How can I write more than one subscript!

I want to know how can I write the subscripts in the following form: f_(T,0) where T (Capital),0 are subscripts. Thank...

8 years ago | 3 answers | 0

### 3

answersQuestion

I want to know what does it mean by the term including "laplace" word in Laplace Transform

When I tried to solve an eqn analytically using Laplace Transform, the soln included the term laplace(qpl(t), t, s). I do not...

8 years ago | 2 answers | 0

### 2

answersQuestion

How can I solve an ODE in Matlab (2008a)

I have an old version of Matlab (2008), when I try to create an ODE function and solve it, it does not work and errors appear as...

8 years ago | 0 answers | 0

### 0

answersQuestion

Solving ODE analytically using Laplace Transform

I want to solve the equation (dq_Pl (t))/dt = f_(Pl,T) R_T (kN_(T,o))/(N_(T,o)+(k-N_(T,o) ) e^(-k_GR t) ) + f_(Pl,H) R_H...

8 years ago | 0 answers | 0