ncwriteschema - assign variables and Dimensions to variables

Question

Clemens 2012-6-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/41659-ncwriteschema-assign-variables-and-dimensions-to-variables

采纳的回答： John

在 MATLAB Online 中打开

I really need help with netCDF Schemas.

I would like to export data and therefor create a netCDF-Schema.

This works:

mySchema.Name   = '/';
mySchema.Format = 'classic';
mySchema.Dimensions(1).Name   = 'rows';
mySchema.Dimensions(1).Length = length([1 2 3 4 5 6 7]');
mySchema.Dimensions(1).Name   = 'columns';
mySchema.Dimensions(1).Length = 1;
ncwriteSchema('Testfile',mySchema)

But when trying to add Variables and try to assign Dimensions to the Variables i get an error:

mySchema.Name   = '/';
mySchema.Format = 'classic';
mySchema.Dimensions(1).Name   = 'rows';
mySchema.Dimensions(1).Length = 7;
mySchema.Dimensions(1).Name   = 'columns';
mySchema.Dimensions(1).Length = 1;
mySchema.Variables(1).Name = 'r0';
mySchema.Variables(1).Dimensions = {'rows' 'columns'};
mySchema.Variables(1).Datatype = 'float'
ncwriteschema('Testfile',mySchema)

ERROR:

Attempt to reference field of non-structure array.
Error in internal.matlab.imagesci.nc/writeDimensionSchema (line 1483)
            dimNames   = {schema.Name};
Error in internal.matlab.imagesci.nc/writeVariableSchema (line 1582)
                    this.writeDimensionSchema(...
Error in internal.matlab.imagesci.nc/writeGroupSchema (line 1676)
                    this.writeVariableSchema(schema.Variables, schema.Name);
Error in internal.matlab.imagesci.nc/writeSchema (line 490)
                this.writeGroupSchema(schema);
Error in ncwriteschema (line 91)
    ncObj.writeSchema(schemastruct);

QUESTION:

I really need help to add the Variables correctly to the netCDF Schema. I hope you guys know an answer.

I think it has something to do with this line:

mySchema.Variables(1).Dimensions = {'rows' 'columns'};

PS: I searched for solutions in MATLAB help and google yet.

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Clemens 2012-6-21

Solution of John works!

Ashish Uthama 2012-6-21

Clemens, you can 'accept' Johns answer if it works for you. That way we know this question is 'solved' :)

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Answer 1

John 2012-6-20

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/41659-ncwriteschema-assign-variables-and-dimensions-to-variables#answer_51309

在 MATLAB Online 中打开

The specification for the variable dimensions should be the same as in the dimensions themselves, i.e. just listing the dimension names isn't enough. Rewrite as

mySchema.Name   = '/';
mySchema.Format = 'classic';
mySchema.Dimensions(1).Name   = 'rows';
mySchema.Dimensions(1).Length = 7;
mySchema.Dimensions(2).Name   = 'columns';
mySchema.Dimensions(2).Length = 1;
mySchema.Variables(1).Name = 'r0';
mySchema.Variables(1).Dimensions(1) = mySchema.Dimensions(1); % rows
mySchema.Variables(1).Dimensions(2) = mySchema.Dimensions(2); % cols
mySchema.Variables(1).Datatype = 'single';
ncwriteschema(ncfile,mySchema)