Using loglog for plotting a logarithmic graph

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Hello.
Part of my 2 part assignment is to complete a loglog graph plot of a certain function, and it happens to be a complicated function;
96818.90647*sqrt(55327.86446+((19.62x)/25.88677539))*log(1+(x/73000))
And the x values I have to plot the function against the x values is in the range of x=10-19700.
The code I have written so far is:
>> x = 10:19700
>> loglog([x],[96818.90647*sqrt(55327.86446+((19.62x)/25.88677539))*log(1+(x/73000))])
But MatLab keeps giving me the unexpected Matlab expression - is there anything that I am doing wrong with my code so far?
All I am trying to do is plot a graph of these x values against the function, and I am very new to Matlab - so any help is greatly appreciated.
Thank you in advance.
- Viran

Accepted Answer

Youssef  Khmou
Youssef Khmou on 22 Nov 2014
You have to use element wise operator ( . before any operator sign) :
x = 10:19700;
y=96818.90647.*sqrt(55327.86446+((19.62*x)/25.88677539)).*log(1+(x/73000));
loglog(x,y)
  2 Comments
Viran Silva
Viran Silva on 22 Nov 2014
Edited: Viran Silva on 22 Nov 2014
Okay, why did that work when you added periods to it?
Youssef  Khmou
Youssef Khmou on 22 Nov 2014
no periods are added. operations of vectors/matrices are not performed unless they compatible in size.

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