MATLAB Central Newsreader - Depth VS longtitude plot

Depth VS longtitude plot

nanxyzzz zhang — Wed, 28 Oct 2009 16:28:03 -0400

    Hi, everyone, i am new to matlab and I have a question.
    i want to make a contour plot, the x axis is longitude and the Y axis is the depth.
    The contour plot that i want to plot is 46*7 array.
    I created the axis like this:

   axesm('mercator','MapLonLimit',[-78.8 158])
   depth=[50 70 100 140 190 240]

     But I have no clue what i should do next. I tried to do it like

   contourf(axesm,depth,plot)

   but it does not work...... Can anyone give some clues?

                                 Thank you very much
                                                XX

Re: Depth VS longtitude plot

NZTideMan — Wed, 28 Oct 2009 20:17:28 -0400

On Oct 29, 5:28 am, "nanxyzzz zhang" <littledd...@gmail.com> wrote:
> Hi, everyone, i am new to matlab and I have a question.
> i want to make a contour plot, the x axis is longitude and the Y axis is the depth.
> The contour plot that i want to plot is 46*7 array.
> I created the axis like this:
>
> axesm('mercator','MapLonLimit',[-78.8 158])
> depth=[50 70 100 140 190 240]
>
> But I have no clue what i should do next. I tried to do it like
>
> contourf(axesm,depth,plot)
>
> but it does not work...... Can anyone give some clues?
>
> Thank you very much
> XX

I assume your array is plot(46,7), correct?
This is a VERY BAD choice of variable name because plot is a
frequently-used function in Matlab, so next time you go to use it, you
will be screwed.
Apart from that, there are two reasons why it won't work:
1. Your depth has only 6 elements, where it should have 7 to match
plot(46,7)
2. You need to transpose the matrix plot, using plot' so that it has
dimensions 7x46

Re: Depth VS longtitude plot

xiao — Thu, 29 Oct 2009 09:06:03 -0400

On Oct 28, 9:17 pm, NZTideMan <mul...@gmail.com> wrote:
> On Oct 29, 5:28 am, "nanxyzzz zhang" <littledd...@gmail.com> wrote:
>
>
>
> > Hi, everyone, i am new to matlab and I have a question.
> > i want to make a contour plot, the x axis is longitude and the Y axis is the depth.
> > The contour plot that i want to plot is 46*7 array.
> > I created the axis like this:
>
> > axesm('mercator','MapLonLimit',[-78.8 158])
> > depth=[50 70 100 140 190 240]
>
> > But I have no clue what i should do next. I tried to do it like
>
> > contourf(axesm,depth,plot)
>
> > but it does not work...... Can anyone give some clues?
>
> > Thank you very much
> > XX
>
> I assume your array is plot(46,7), correct?
> This is a VERY BAD choice of variable name because plot is a
> frequently-used function in Matlab, so next time you go to use it, you
> will be screwed.
> Apart from that, there are two reasons why it won't work:
> 1. Your depth has only 6 elements, where it should have 7 to match
> plot(46,7)
> 2. You need to transpose the matrix plot, using plot' so that it has
> dimensions 7x46

Thank you very much NZ, I transposed my depth array and renamed the
plot array to temperature.
But it looks it still does not work. When I try it like this:

contourf(axesm,depth,temperature)

it gave me the error:
??? Undefined function or method 'almanac' for input arguments of type
'char'.

Error in ==> axesmui>geoidupdate at 2724
    geoidvec(n+1,:) = almanac(planet,param);

Error in ==> axesmui>MainDialog at 228
        [ptr,list] = geoidupdate(mstruct.zone,mstruct.geoid);

Error in ==> axesmui at 109
        eval([callback,'(''',action,''')'])

Error in ==> axesmui at 62
            axesmui('MainDialog','AxesEntries')

Error in ==> axesm at 67
   cancelflag = axesmui;

Why is that? thank you very much

                              XX

Re: Depth VS longtitude plot

NZTideMan — Thu, 29 Oct 2009 19:09:35 -0400

On Oct 29, 10:06 pm, xiao <littledd...@gmail.com> wrote:
> On Oct 28, 9:17 pm, NZTideMan <mul...@gmail.com> wrote:
>
>
>
> > On Oct 29, 5:28 am, "nanxyzzz zhang" <littledd...@gmail.com> wrote:
>
> > > Hi, everyone, i am new to matlab and I have a question.
> > > i want to make a contour plot, the x axis is longitude and the Y axis is the depth.
> > > The contour plot that i want to plot is 46*7 array.
> > > I created the axis like this:
>
> > > axesm('mercator','MapLonLimit',[-78.8 158])
> > > depth=[50 70 100 140 190 240]
>
> > > But I have no clue what i should do next. I tried to do it like
>
> > > contourf(axesm,depth,plot)
>
> > > but it does not work...... Can anyone give some clues?
>
> > > Thank you very much
> > > XX
>
> > I assume your array is plot(46,7), correct?
> > This is a VERY BAD choice of variable name because plot is a
> > frequently-used function in Matlab, so next time you go to use it, you
> > will be screwed.
> > Apart from that, there are two reasons why it won't work:
> > 1. Your depth has only 6 elements, where it should have 7 to match
> > plot(46,7)
> > 2. You need to transpose the matrix plot, using plot' so that it has
> > dimensions 7x46
>
> Thank you very much NZ, I transposed my depth array and renamed the
> plot array to temperature.
> But it looks it still does not work. When I try it like this:
>
> contourf(axesm,depth,temperature)
>
> it gave me the error:
> ??? Undefined function or method 'almanac' for input arguments of type
> 'char'.
>
> Error in ==> axesmui>geoidupdate at 2724
> geoidvec(n+1,:) = almanac(planet,param);
>
> Error in ==> axesmui>MainDialog at 228
> [ptr,list] = geoidupdate(mstruct.zone,mstruct.geoid);
>
> Error in ==> axesmui at 109
> eval([callback,'(''',action,''')'])
>
> Error in ==> axesmui at 62
> axesmui('MainDialog','AxesEntries')
>
> Error in ==> axesm at 67
> cancelflag = axesmui;
>
> Why is that? thank you very much
>
> XX

No, it's not contourf that's giving you that error, it's axesm.
I don't have that in my version of Matlab, so I can't help you.