Mathematica:how to plot a maximum point in a graph

shafieza_garl

anyone can help me to plot a point.

Code:

 r = Plot[Sin[j], {j, 0, Pi}];

what i am doing is i use FindMaximum first to know the point of maximum.

Code:

FindMaximum[Sin[j], {j, Pi}]

then i manually key in the x,y coordinate from the search.

Code:

onedot = ListPlot[{{1.5707963267948966, 1}}, 
   PlotStyle -> {Hue[0.67], AbsolutePointSize[7]}];
Show[r, onedot]

is there any way i can plot the maximum point without key-in manually using the findmaximum point.
thanks

chiro

Quote by shafieza_garl

anyone can help me to plot a point.

Code:

 r = Plot[Sin[j], {j, 0, Pi}];

what i am doing is i use FindMaximum first to know the point of maximum.

Code:

FindMaximum[Sin[j], {j, Pi}]

then i manually key in the x,y coordinate from the search.

Code:

onedot = ListPlot[{{1.5707963267948966, 1}}, 
   PlotStyle -> {Hue[0.67], AbsolutePointSize[7]}];
Show[r, onedot]

is there any way i can plot the maximum point without key-in manually using the findmaximum point.
thanks

One suggestion I have is to create a test function with {-1,0} {0,maxpoint} and {+1,0) and then plot that data like any other data. If you need to adjust scaling or if Mathematica produces a very narrow graph then make the non-max points larger in the respective directions.

If you need the point at its original position then just add the x coordinate to every x point in the dataset.

Bill Simpson

r = Plot[Sin[j], {j, 0, Pi}];
onedot = ListPlot[{j, 1} /. Rest[FindMaximum[Sin[j], {j, Pi}]], PlotStyle -> {Hue[0.67], AbsolutePointSize[7]}];
Show[r, onedot]

shafieza_garl

Quote by Bill Simpson

r = Plot[Sin[j], {j, 0, Pi}];
onedot = ListPlot[{j, 1} /. Rest[FindMaximum[Sin[j], {j, Pi}]], PlotStyle -> {Hue[0.67], AbsolutePointSize[7]}];
Show[r, onedot]

thanx 4 ur reply.1 more question. if i dont want to put value 1 by myself and i want the same as finding the j-value(using findmaximum).

Code:

onedot = ListPlot[{j, k} /. Rest[FindMaximum[Sin[j], {j, Pi}]],  PlotStyle -> {Hue[0.67], AbsolutePointSize[7]}];

is this possible to do?
thanks again.

Bill Simpson

r = Plot[Sin[j], {j, 0, Pi}];
onedot = ListPlot[{j, Sin[j]} /. Rest[FindMaximum[Sin[j], {j, Pi}]], \
PlotStyle -> {Hue[0.67], AbsolutePointSize[7]}];
Show[r, onedot]

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Bill Simpson	r = Plot[Sin[j], {j, 0, Pi}]; onedot = ListPlot[{j, 1} /. Rest[FindMaximum[Sin[j], {j, Pi}]], PlotStyle -> {Hue[0.67], AbsolutePointSize[7]}]; Show[r, onedot]